"Knowledge has three degrees--opinion, science, illumination. The means or instrument of the first is sense; of the second, dialectic; of the third, intuition."

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Aristotle can be regarded as the father of logic. But his logic is too scholastic, full of subtleties, and fundamentally has not been of much value to the human understanding. It is a dialectic and an organon for the art of disputation.

— Immanuel Kant