Moreover, the position of parents differs from that of other benefactors, for their having given formerly to their children does not stand in the way of their giving now and hereafter; and also, there is no fear of their falsely asserting that they have given: with others one has to inquire not only whether they have received, but whether they have given; but the good deeds of parents are placed beyond doubt. In the next place, one benefit bestowed by parents is the same for all, and might be counted once for all; while the others which they bestow are of various kinds, unlike one to another, differing from one another by the widest possible intervals; they can therefore come under no regular rule, since it would be more just to leave them all unrewarded than to give the same reward to all.