Natural law is nothing but the dictates of reason properly exercised

"(...) It may be worthwhile to note that Catholic philosophy does not endorse the collectivist doctrine. According to the teachings of the Roman Church natural law is nothing but the dictates of reason properly exercised, and man is capable of acquiring its full knowledge even if unaided by supernatural revelation. "God so created man as to bestow on him endowments amply sufficient for him to attain his last end. Over and above this He decreed to make the attainment of beatitude yet easier for man by placing within his reach a far simpler and far more certain way of knowing the law on the observance of which his fate depended." Cf. G.H. Joyce, article "Revelation" in The Catholic Encyclopedia vol. 13 (New York: Encyclopedia Press, 1913), pp. 1-5. Citado por Mises em Money, Method, and the Market Process