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So early Greek philosophy was speculative, that is, it wasn't concerned with phenomena and factuality as much as it was concerned with the reasoning process itself. From the beginning, Greek philosophy was concerned with this reasoning process, particularly the process of rational demonstration. The truth of a proposition was an aspect of its demonstration, not its physical reality; a flawless rational demonstration produced certain knowledge.
Most of this speculation concerned the nature of the changing, physical world. The early Greek philosophers were concerned with finding the unchanging principle or substance that lay behind all change and phenomena. The stable, unchanging component of the universe the Greeks called, physis , so early Greek philosophy was really a speculative physics.
Eventually, a wide range of activities would be subsumed under the category of philosophy, representing the entire range of human rational activities. The unifying factor was demonstration, that is, each activity was a philosophy in that it involved principles of rational demonstration. The central categories of European philosophy are:
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Logic
Logic is the science of demonstration ; it lays down the rules for making propositions and constructing proofs. Logic is really the core of philosophy.
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Rhetoric
Logic is a science of language, and so is rhetoric. While logic is the science of propositions and demonstration, rhetoric is the science of persuasion. It is less concerned with the truth of a proposition as it is concerned with using language, gesture, argument, and emotion to persuade other people of a truth or an opinion.
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Physics
Physics is the source of European philosophy; in its original form, physics was the study of the underlying principles of change in the natural world. Eventually, physics became the study of change in the material world and the laws underlying those changes (this is still true of physics today).
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Metaphysics
Metaphysics is the study of the principles behind the principles governing the universe; metaphysics, you might say, is the science of first or originary principles. For instance, if you conclude that God is behind everything in the universe, the study of God is a branch of metaphysics.
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Theology
Theology is a branch of metaphysics and concerns the nature of the divine and the relationship of that nature to the physical, moral, and spiritual worlds.
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Ethics
Ethics is the science of human action; its primary question from classical Greece onwards is "what is a good life?"
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Politics
Politics is the study of human institutions and governments; it is essentially a branch of ethics.
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Aesthetics
Aesthetics, which originates with the Greeks, is the science of the beautiful; this includes both human art as well as natural beauty and order.
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Richard Hooker
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