From Rothband

Posted on: March 3, 2021 at 17:40:11 CT

"Thus, let there be no mistake: in the Thomistic tradition, natural law is ethical as well as physical law; and the instrument by which man apprehends such law is his reason — not faith, or intuition, or grace, revelation, or anything else.[11] In the contemporary atmosphere of sharp dichotomy between natural law and reason — and especially amid the irrationalist sentiments of "conservative" thought — this cannot be underscored too often. Hence, St. Thomas Aquinas, in the words of the eminent historian of philosophy Father Copleston, "emphasized the place and function of reason in moral conduct. He [Aquinas] shared with Aristotle the view that it is the possession of reason which distinguished man from the animals" and which "enables him to act deliberately in view of the consciously apprehended end and raises him above the level of purely instinctive behavior."[12]"

I equate arriving at knowledge via human reasoning to "knowing" something to be true without being taught.

From Thomas Aquinas:

"It is therefore evident that, as regards the general principles whether of speculative or of practical reason, truth or rightness is the same for all, and is equally KNOWN by all"

From CS Lewis:
"This law was called the Law of Nature because people thought that every one knew it by nature and did not need to be taught it. They did not mean, of course, that you might not find an odd individual here and there who did not know it, just as you find a few people who are colour-blind or have no ear for a tune. But taking the race as a whole, they thought that the human idea of decent behaviour was obvious to every one."