Thomas Aquinas

“ For certain virtues there are which render another his due, but are unable to render the equal due. In the first place, whatever man renders to God is due, yet it cannot be equal, as though man rendered to God as much as he owes Him, according to Ps. 115:12, "What shall I render to the Lord for all the things that He hath rendered to me?" In this respect "religion" is annexed to justice since, according to Tully (De invent. ii, 53) , it consists in offering service and ceremonial rites or worship to "some superior nature that men call divine." ”

“ As regards things which have to be done in particular cases beside the general laws, he mentions "common sense" or "good judgment*," which is our guide in such like matters, as stated above (Q [51] , A [4] ) in the treatise on prudence: wherefore he says that it is a "voluntary justification," because by his own free will man observes what is just according to his judgment and not according to the written law. ”