X. Therefore compassion and envy are consistent in the same man; for whoever is uneasy at any one's adversity is also uneasy at another's prosperity: as Theophrastus, while he laments the death of his companion Callisthenes, is at the same time disturbed at the success of Alexander; and therefore he says that Callisthenes met with man of the greatest power and good fortune, but one who did not know how to make use of his good fortune. And as pity is an uneasiness which arises from the misfortunes of another, so envy is an uneasiness that proceeds from the good success of another: therefore whoever is capable of pity is capable of envy. But a wise man is incapable of envy, and consequently incapable of pity. But were a wise man used to grieve, to pity also would be familiar to him; therefore to grieve is a feeling which cannot affect a wise man. Now, though these reasonings of the Stoics, and their conclusions, are rather strained and distorted, and ought to be expressed in a less stringent and narrow manner, yet great stress is to be laid on the opinions of those men who have a peculiarly bold and manly turn of thought and sentiment. For our friends the Peripatetics, notwithstanding all their erudition, gravity, and fluency of language, do not satisfy me about the moderation of these disorders and diseases of the soul which they insist upon; for every evil, though moderate, is in its nature great. 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. And therefore I must explain the origin of this pain, that is to say, the cause that occasions this grief in the mind, as if it were a sickness of the body. For as physicians think they have found out the cure when they have discovered the cause of the distemper, so we shall discover the method of curing melancholy when the cause of it is found out.