How did Thomas Aquinas explain why faith and reason cannot ultimately contradict each other?

Thomas Aquinas argued that faith and reason cannot ultimately contradict each other because both originate from the same source: God. He maintained that the fundamental consistency of nature, which possesses necessary laws, is guaranteed by the creative wisdom of God.12

Aquinas viewed theology as a "science" that integrates the rules and structures of rational activity in the light of faith. While the philosopher relies solely on the natural light of reason, the theologian accepts faith as a starting point and proceeds to conclusions using rational methods.2

He believed that faith presupposes and requires natural knowledge of the world, noting that errors concerning creation can lead people astray from the truths of faith. By defending the autonomy of natural things, Aquinas argued that recognizing the perfection of the creature actually honors the perfection of the creative power itself. Consequently, he rejected the "double truth" theory—which suggested that faith and reason could be contradictory—asserting instead that they must be in meaningful coordination.123