 This conceptual shift was initiated at least implicitly by Vitoria in his commentary on quaestio 57. Thomas gives as an example of what is just by nature in an absolute sense the natural inclination of the male to the female for the sake of procreation and the efforts of parents to nurture their children. Vitoria replaces these examples by the obligation to return deposits and the Golden Rule. This moralization of natural law is not found in all the authors under consideration. Molina, for example, argues that someone who uses the extreme poverty of another to make that person his slave, instead of providing help without imposing conditions, commits a sin against charity; but the contract is valid according to natural law (Molina-DII II, disp. 34). 