Book 1
10.14
(it would seem, however, that such cases also are due to chance). Those things are the result of compulsion which are done by the agents themselves in opposition to their desire or calculation.
10.15
Things are the result of habit, when they are done because they have often been done.
10.16
Things are the result of calculation which are done because, of the goods already mentioned, they appear to be expedient either as an end or means to an end, provided they are done by reason of their being expedient; for even the intemperate do certain things that are expedient, for the sake, not of expediency, but of pleasure. Passion and anger are the causes of acts of revenge.
10.17
But there is a difference between revenge and punishment; the latter is inflicted in the interest of the sufferer, the former in the interest of him who inflicts it, that he may obtain satisfaction.
10.18
We will define anger when we come to speak of the emotions.Book 2.2. Desire is the cause of things being done that are apparently pleasant. The things which are familiar and to which we have become accustomed are among pleasant things; for men do with pleasure many things which are not naturally pleasant, when they have become accustomed to them.
