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 πάθος, 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.
XI. The whole cause, then, is in opinion; and this observation applies not to this grief alone, but to every other disorder of the mind, which are of four sorts, but consisting of many parts. For as every disorder or perturbation is a motion of the mind, either devoid of reason, or in despite of reason, or in disobedience to reason, and as that motion is excited by an opinion of either good or evil; these four perturbations are divided equally into two parts; for two of them proceed from an opinion of good, one of which is an exulting pleasure, that is to say, a joy elated beyond measure, arising from an opinion of some present great good; the other is a desire which may fairly be called even a lust, and is an immoderate inclination after some conceived great good without any obedience to reason. Therefore these two kinds, the exulting pleasure and the lust, have their rise from an opinion of good, as
