
Thomas Aquinas: A Medieval Psychologist? | Fr. Cajetan Cuddy, O.P.
The Thomistic Institute
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The Principle of Non-Contradiction
Aquinas developed the principle of non-contradiction from sense perception. From that, Aquinas proved through reason profound truths like God's existence and murder is wrong. He then went on to prove things such as body being real and soul being real in a different way.
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