He conceived of philosophy as an all-embracing science to which all other sciences must be referred as their ultimate source and foundation. No subsidiary science deals with all things as they are, but only as they appear, whereas philosophy, and especially metaphysics, deals with all things as they are and insofar as they are. Philosophy is an inquiry after the truth of both human and divine things, based on the testimony of God, who reveals himself either through the world of created things or by direct teaching. Consequently, nature and the Scriptures are the two codes on which philosophy must be built.
Epistemology
In his actual approach to philosophy, Campanella discussed first the possibility and reality of knowledge, thus anticipating a common trend among later thinkers. He was the first philosopher (antedating René Descartes) to assert the need of positing a universal doubt at the beginning of his system and to state the principle of self-consciousness as the basis of knowledge and certitude. He distinguished between innate and acquired knowledge. Innate knowledge (notitia innata) is cognition through self-presence and belongs to the very essence of the soul; acquired knowledge (notitia illata) is the soul's cognition of external things.
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