Men are deprived of what is good unwillingly. Nevertheless they are deprived either by being deceived or beguiled, or by being compelled and not believing. He who believes not, has already made himself a willing captive; and he who changes his persuasion is cozened, while he forgets that time imperceptibly takes away some things, and reason others. And after an opinion has been entertained, pain and anguish, and on the other hand contentiousness and anger, compel. Above all, men are beguiled who are either bewitched by pleasure or terrified by fear. And all these are voluntary changes, but by none of these will knowledge ever be attained.