In one of his proofs for the existence of God, Aquinas says, "it is necessary to admit a first cause, to which everyone gives the name of Reason."

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Aquinas actually names the first cause "God," not "Reason." The quote that is often paraphrased as "the name of God is Reason" is not found in Aquinas' writings. This concept of reason as the basis for belief in God is more associated with the Enlightenment philosopher Johann Wolfgang von Goethe.

In One of His Proofs for the Existence of God