 Vitoria followed this schema in his lectures on the Summa theologiae, especially in his 1533–1534 lectures and in his commentary. He treated law as made by “reason and enlightenment”, not just the will. Natural law, derived from eternal law by reason, was binding on all humanity; its principles applied to mutable situations and different peoples. God was the indirectly cause of human laws, which were binding on the conscience of individuals. There was a human urge to obey natural law, for example, by honoring one’s parents, preferably out of love. Failure to heed these precepts was a moral fault. 