The very meaning of the word describes the whole thing about which we are inquiring, both as to its substance and character.

For we must necessarily understand by "sound" those whose minds are under no perturbation from any motion as if it were a disease.

They who are differently affected we must necessarily call "unsound." So that nothing is better than what is usual in Latin, to say that they who are run away with by their lust or anger have quitted the command over themselves; though anger includes lust, for anger is defined to be the lust of revenge.

They, then, who are said not to be masters of themselves, are said to be so because they are not under the government of reason, to which is assigned by nature the power over the whole soul.

Why the Greeks should call this mania, I do not easily apprehend; but we define it much better than they, for we distinguish this madness (_insania_), which, being allied to folly, is more extensive, from what we call _furor_, or raving.