But our object is to make out that the wise man is free from all evil; for as the body is unsound if it is ever so slightly affected, so the mind under any moderate disorder loses its soundness; therefore the Romans have, with their usual accuracy of expression, called trouble, and anguish, and vexation, on account of the analogy between a troubled mind and a diseased body, disorders.

The Greeks call all perturbation of mind by pretty nearly the same name; for they name every turbid motion of the soul [Greek: pathos], that is to say, a distemper.

But we have given them a more proper name; for a disorder of the mind is very like a disease of the body.

But lust does not resemble sickness; neither does immoderate joy, which is an elated and exulting pleasure of the mind.

Fear, too, is not very like a distemper, though it is akin to grief of mind, but properly, as is also the case with sickness of the body, so too sickness of mind has no name separated from pain.