The main stream of philosophy had previously centered on God, either as the key problem or question, or, as with St. Anselm, as the starting point of all knowledge. In Descartes, philosophy began to eliminate this concern. First of all, Descartes’s concern is for knowledge or truth as such, truth as something separate from God and not necessarily related to God. Later on, to eliminate his epistemological problem of contact between two alien substances, mind and the world of matter, Descartes posited
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