Cato the Younger

It would appear, too, that Cato’s reluctance to be persuaded made his learning anything more laborious. For, to learn is simply to allow something to be done to you, and to be quickly persuaded is natural for those who are less able to offer resistance. Therefore young men are more easily persuaded than old men, and sick folk, than those who are well, and, in a word, where the power to raise objections is weakest, the act of submission is easiest.