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Ludwig Andreas von Feuerbach (July 28, 1804 – September 13, 1872) was a German philosopher and anthropologist. He was the fourth son of the eminent jurist Paul Johann Anselm Ritter von Feuerbach. His first book, published anonymously, Gedanken über Tod und Unsterblichkeit (1830), contains an attack on personal immortality and an advocacy of the Spinozistic immortality of reabsorption in nature. These principles, combined with his embarrassed manner of public speaking, debarred him from academic advancement. After some years of struggling, during which he published his Geschichte der neueren Philosophie (2 vols., 1833-1837, 2nd ed. 1844), and Abelard und Heloise (1834, 3rd ed. 1877), he married in 1837 and lived a rural existence at Bruckberg near Nuremberg, supported by his wife's share in a small porcelain factory. In two works of this period, Pierre Bayle (1838) and Philosophie und Christentum (1839), which deal largely with theology, he held that he had proven "that Christianity has in fact long vanished not only from the reason but from the life of mankind, that it is nothing more than a fixed idea." This attack is followed up in his most important work, Das Wesen des Christentums (1841), which was translated into English (The Essence of Christianity, by George Eliot, 1853, 2nd ed. 1881), French, Spanish and Russian. Its aim may be described shortly as an effort to humanize theology. He lays it down that man, so far as he is rational, is to himself his own object of thought. Religion is consciousness of the infinite. Religion therefore is "nothing else than the consciousness of the infinity of the consciousness; or, in the consciousness of the infinite, the conscious subject has for his object the infinity of his own nature." Feuerbach's theme was a derivation of Hegel's speculative theology in which the Creation remains a part of the Creator, while the Creator remains greater than the Creation. When the student Feuerbach presented his own theory to professor Hegel, Hegel refused to reply positively to it. In part I of his book Feuerbach develops what he calls the "true or anthropological essence of religion." Treating of God in his various aspects "as a being of the understanding," "as a moral being or law," "as love" and so on. Feuerbach talks of how man is equally a conscious being, more so than God because man has placed upon God the ability of understanding. Man contemplates many things and in doing so he becomes acquainted with himself. Feuerbach shows that in every aspect God corresponds to some feature or need of human nature. "If man is to find contentment in God," he claims, "he must find himself in God." Thus God is nothing else than man: he is, so to speak, the outward projection of man's inward nature. This projection is dubbed as a chimaera by Feuerbach, that God and the idea of a higher being is dependent upon the aspect of benevolence. Feuerbach states that, “a God who is not benevolent, not just, not wise, is no God,” and continues to say that qualities are not suddenly denoted as divine because of their godly association. The qualities themselves are divine therefore making God divine, indicating that man is capable of understanding and applying meanings of divinity to religion and not that religion makes a man divine. The force of this attraction to religion though, giving divinity to a figure like God, is explained by Feuerbach as God is a being that acts throughout man in all forms. God, “is the principle of [man's] salvation, of [man's] good dispositions and actions, consequently [man's] own good principle and nature.” It appeals to man to give qualities to the idol of their religion because without these qualities a figure such as God would become merely an object, its importance would become obsolete, there would no longer be a feeling of an existence for God. Therefore, Feuerbach says, when man removes all qualities from God, “God is no longer anything more to him than a negative being.” Additionally, because man is imaginative, God is given traits and there holds the appeal. God is a part of man through the invention of a God. Equally though, man is repulsed by God because, “God alone is the being who acts of himself.” In part 2 he discusses the "false or theological essence of religion," i.e. the view which regards God as having a separate existence over against man. Hence arise various mistaken beliefs, such as the belief in revelation which he believes not only injures the moral sense, but also "poisons, nay destroys, the divinest feeling in man, the sense of truth," and the belief in sacraments such as the Lord's Supper, which is to him a piece of religious materialism of which "the necessary consequences are superstition and immorality." Georg Wilhelm Friedrich Hegel (IPA: [gek vlhlm fidç hegəl]) (August 27, 1770 – November 14, 1831) was a German philosopher, and with Johann Gottlieb Fichte and Friedrich Wilhelm Joseph Schelling, one of the creators of German idealism. Hegel discussed a relation between nature and freedom, immanence and transcendence, and the unification of these dualities without eliminating either pole or reducing it to the other. His influential conceptions are of speculative logic or "dialectic," "absolute idealism," "Spirit," the "Master/Slave" dialectic, "ethical life," and the importance of history. Hegel introduced a system for understanding the history of philosophy and the world itself, often described as a progression in which each successive movement emerges as a solution to the contradictions inherent in the preceding movement. For example, the French Revolution for Hegel constitutes the introduction of real individual political freedom into European societies for the first time in recorded history. But precisely because of its absolute novelty, it is also absolutely radical: on the one hand the upsurge of violence required to carry out the revolution cannot cease to be itself, while on the other, it has already consumed its opponent. The revolution therefore has nowhere to turn but onto its own result: the hard-won freedom is consumed by a brutal Reign of Terror. History, however, progresses by learning from its mistakes: only after and precisely because of this experience can one posit the existence of a constitutional state of free citizens, embodying both the benevolent organizing power of rational government and the revolutionary ideals of freedom and equality. Hegel's remarks on the French revolution led German poet Heinrich Heine to label him "The Orléans of German Philosophy". Hegel's writing style is difficult to read; he is described by Bertrand Russell in the History of Western Philosophy as the single most difficult philosopher to understand. This is partly because Hegel tried to develop a new form of thinking and logic, which he called "speculative reason" and which includes the more famous concept of "dialectic," to try to overcome what he saw as the limitations of both common sense and of traditional philosophy at grasping philosophical problems and the relation between thought and reality. [edit] Teachings [edit] The concept of freedom through Hegel's method Hegel's thinking can be understood as a constructive development within the broadly Platonic tradition that includes Aristotle and Kant. To this list one could add Proclus, Meister Eckhart, Leibniz, Bahlsen, Spinoza, Plotinus, Jakob Boehme, and Rousseau. What all these thinkers share, which distinguishes them from materialists like Epicurus, the Stoics, and Thomas Hobbes, and from empiricists like David Hume, is that they regard freedom or self-determination both as real and as having important ontological implications, for soul or mind or divinity. This focus on freedom is what generates Plato's notion (in the Phaedo, Republic, and Timaeus) of the soul as having a higher or fuller kind of reality than inanimate objects possess. While Aristotle criticizes Plato's "Forms," he preserves Plato's preoccupation with the ontological implications of self-determination, in his conceptions of ethical reasoning, the hierarchy of soul in nature, the order of the cosmos, and the prime mover. Kant, likewise, preserves this preoccupation of Plato's in his notions of moral and noumenal freedom, and God. Edmund Gustav Albrecht Husserl (IPA: [hsrl]; April 8, 1859 – April 26, 1938) was a philosopher, known as the father of phenomenology. His work was a break with the purely positivist orientation and understanding of the science and philosophy of his day, giving weight to subjective experience as the source of all of our knowledge of objective phenomena. In these first works he tries to combine mathematics, psychology and philosophy with a main goal to provide a sound foundation for mathematics. He analyzes the psychological process needed to obtain the concept of number and then tries to build up a systematical theory on this analysis. To achieve this he uses several methods and concepts taken from his teachers. From Weierstrass he derives the idea that we generate the concept of number by counting a certain collection of objects. From Brentano and Stumpf he takes over the distinction between proper and improper presenting. In an example Husserl explains this in the following way: if you are standing in front of a house, you have a proper, direct presentation of that house, but if you are looking for it and ask for directions, then these directions (e.g. the house on the corner of this and that street) are an indirect, improper presentation. In other words, you can have a proper presentation of an object if it is actually present, and an improper (or symbolic as he also calls it) if you only can indicate that object through signs, symbols, etc. Husserl's 1901 Logical Investigations is considered the starting point for the formal theory of wholes and their parts known as mereology.[1] Another important element that Husserl took over from Brentano is intentionality, the notion that the main characteristic of consciousness is that it is always intentional. While often simplistically summarised as "aboutness" or the relationship between mental acts and the external world, Brentano defined it as the main characteristic of mental phenomena, by which they could be distinguished from physical phenomena. Every mental phenomenon, every psychological act has a content, is directed at an object (the intentional object). Every belief, desire etc. has an object that they are about: the believed, the wanted. Brentano used the expression "intentional inexistence" to indicate the status of the objects of thought in the mind. The property of being intentional, of having an intentional object, was the key feature to distinguish mental phenomena and physical phenomena, because physical phenomena lack intentionality altogether. Husserl expressed clearly the difference between meaning and object. He identified several different kinds of names. For example, there are names that have the role of properties that uniquely identify an object. Each of these names express a meaning and designate the same object. Examples of this are "the victor in Jena" and "the loser in Waterloo", or "the equilateral triangle" and "the equiangular triangle"; in both cases, both names express different meanings, but designate the same object. There are names which have no meaning, but have the role of designating an object: "Aristotle", "Socrates", and so on. Finally, there are names which designate a variety of objects. These are called "universal names"; their meaning is a "concept" and refers to a series of objects (the extension of the concept). The way we know sensible objects is called "sensible intuition". Husserl also identifies a series of "formal words" which are necessary to form sentences and have no sensible correlates. Examples of formal words are "a", "the", "more than", "over", "under", "two", "group", and so on. Every sentence must contain formal words to designate what Husserl calls "formal categories". There are two kinds of categories: meaning categories and formal-ontological categories. Meaning categories relate judgments; they include forms of conjunction, disjunction, forms of plural, among others. Formal-ontological categories relate objects and include notions such as set, cardinal number, ordinal number, part and whole, relation, and so on. The way we know these categories is through a faculty of understanding called "categorial intuition". Through sensible intuition our consciousness constitutes what Husserl calls a "situation of affairs" (Sachlage). It is a passive constitution where objects themselves are presented to us. To this situation of affairs, through categorial intuition, we are able to constitute a "state of affairs" (Sachverhalt). One situation of affairs through objective acts of consciousness (acts of constituting categorially) can serve as the basis for constituting multiple states of affairs. For example, suppose a and b are two sensible objects in a certain situation of affairs. We can use it as basis to say, "a<b" and "b>a", two judgments which designate different states of affairs. For Husserl a sentence has a proposition or judgment as its meaning, and refers to a state of affairs which has a situation of affairs as a reference base. [edit] Philosophy of logic and mathematics Edmund Husserl held the belief that truth-in-itself has as ontological correlate beingin-itself, just as meaning categories have formal-ontological categories as correlates. The discipline of logic is a formal theory of judgment, that studies the formal a priori relations among judgments using meaning categories. Mathematics, on the other hand, is formal ontology, it studies all the possible forms of being (of objects). So, in both of these disciplines, formal categories, in their different forms, are the objects of study, not the sensible objects themselves. The problem with the psychological approach to mathematics and logic is that it fails to account for the fact that it is about formal categories, not abstractions from sensibility alone. The reason why we do not deal with sensible objects in mathematics is because of another faculty of understanding called "categorial abstraction". Through this faculty we are able to get rid of sensible components of judgments, and just focus on formal categories themselves. Thanks to "eidetic intuition" (or "essential intuition"), we are able to grasp the possibility, impossibility, necessity and contingency among concepts or among formal categories. Categorial intuition, along with categorial abstraction and eidetic intuition, are the basis for logical and mathematical knowledge. Martin Heidegger (September 26, 1889 – May 26, 1976) (pronounced [ma tin ha dg]) was an influential German philosopher. His best known book, Being and Time, is generally considered to be one of the key philosophical works of the 20th century. Heidegger claimed that Western philosophy has, since Plato, misunderstood what it means for something to be, tending to approach this question in terms of a being, rather than asking about being itself. In other words, Heidegger believed all investigations of being have historically focused on particular entities and their properties, or have treated being itself as an entity, or substance, with properties. A more authentic analysis of being would, for Heidegger, investigate "that on the basis of which beings are already understood," or that which underlies all particular entities and allows them to show up as entities in the first place.[1] But since philosophers and scientists have overlooked the more basic, pre-theoretical ways of being from which their theories derive, and since they have incorrectly applied those theories universally, they have confused our understanding of being and human existence. To avoid these deep-rooted misconceptions, Heidegger believed philosophical inquiry must be conducted in a new way, through a process of retracing the steps of the history of philosophy. Heidegger argued that this misunderstanding, commencing from Plato, has left its traces in every stage of Western thought. All that we understand, from the way we speak to our notions of "common sense," is susceptible to error, to fundamental mistakes about the nature of being. These mistakes filter into the terms through which being is articulated in the history of philosophy—reality, logic, God, consciousness, presence, et cetera. In his later philosophy, Heidegger argues that this profoundly affects the way in which human beings relate to modern technology. His work has exercised a deep influence on philosophy, theology and the humanities, being key to the development of existentialism, hermeneutics, deconstruction, postmodernism, and continental philosophy in general. Heidegger's thought directly informs the works of major philosophers such as Karl Jaspers, Leo Strauss, Hans-Georg Gadamer, Jean-Paul Sartre, Emmanuel Lévinas, Hannah Arendt, Maurice Merleau-Ponty, Michel Foucault, Richard Rorty, and Jacques Derrida. Heidegger infamously supported National Socialism. This has provoked fierce debate among and between supporters and detractors: some see it as a personal folly largely irrelevant to his philosophy, while others think it reveals flaws inherent in his thought. Heidegger attempts to marry two insights. The first of these is Heidegger’s insight that, in the course of over two thousand years of history, philosophy has attended to all the beings that can be found in the world (including the “world” itself), but has forgotten to ask what “being” itself is. This is Heidegger’s “question of being,” and it is Heidegger’s fundamental concern throughout his work from the beginning of his career until its end. One crucial source of this insight was Heidegger’s reading of Franz Brentano’s treatise on Aristotle’s manifold uses of the word “being,” a work which provoked Heidegger to ask what kind of unity underlies this multiplicity of uses. Heidegger opens his magnum opus, Being and Time, with a citation from Plato’s Sophist [6] indicating that Western philosophy has neglected “being” because it was considered obvious, rather than as worthy of question. Heidegger’s intuition about the question of being is thus a historical argument, which in his later work becomes his concern with the “history of being,” that is, the history of the forgetting of being, which according to Heidegger requires that philosophy retrace its footsteps through a productive “destruction” of the history of philosophy. The second intuition animating Heidegger’s philosophy derives from the influence of Edmund Husserl, a philosopher largely uninterested in questions of philosophical history. Rather, Husserl argued that all that philosophy could and should be is a description of experience (hence the phenomenological slogan, “to the things themselves”). But for Heidegger, this meant understanding that experience is always already situated in a world and in ways of being. Thus Husserl's understanding that all consciousness is "intentional" (in the sense that it is always intended toward something, and is always "about" something; intentionality has been called the "aboutness" of things) is transformed in Heidegger's philosophy, becoming the thought that all experience is grounded in "care." This is the basis of Heidegger’s “existential analytic,” as he develops it in Being and Time. Heidegger argues that to be able to describe experience properly means finding the being for whom such a description might matter. Heidegger thus conducts his description of experience with reference to “Dasein," the being for whom being is a question.[7] In Being and Time, Heidegger criticized the abstract and metaphysical character of traditional ways of grasping human existence as rational animal, person, man, soul, spirit, or subject. Dasein, then, is not intended as a way of conducting a "philosophical anthropology," but is rather understood by Heidegger to be the condition of possibility for anything like a "philosophical anthropology."[8] Dasein, according to Heidegger, is care. In the course of his existential analytic, Heidegger argues that Dasein, who finds itself thrown into the world amidst things and with others, is thrown into its possibilities, including the possibility and inevitability of one’s own mortality. The need for Dasein to assume these possibilities, that is, the need to be responsible for one’s own existence, is the basis of Heidegger’s notions of authenticity and resoluteness—that is, of those specific possibilities for Dasein which depend on escaping the “vulgar” temporality of calculation and of public life. The marriage of these two insights depends on the fact that each of them is essentially concerned with time. That Dasein is thrown into an already existing world and thus into its mortal possibilities does not only mean that Dasein is an essentially temporal being; it also implies that the description of Dasein can only be carried out in terms inherited from the Western tradition itself. For Heidegger, unlike for Husserl, philosophical terminology could not be divorced from the history of the use of that terminology, and thus genuine philosophy could not avoid confronting questions of language and meaning. The existential analytic of Being and Time was thus always only a first step in Heidegger’s philosophy, to be followed by the “destruction” of the history of philosophy, that is, a transformation of its language and meaning, that would have made of the existential analytic only a kind of “limit case” (in the sense in which special relativity is a limit case of general relativity).