The Divine Institutes

There are three passions, or, so to speak, three furies, which excite such great perturbations in the souls of men, and sometimes compel them to offend in such a manner, as to permit them to have regard neither for their reputation nor for their personal safety: these are anger, which desires vengeance; love of gain, which longs for riches; lust, which seeks for pleasures. We must above all things resist these vices: these trunks must be rooted up, that virtues may be implanted. The Stoics are of opinion that these passions must be cut off; the Peripatetics think that they must be restrained. Neither of them judge rightly, because they cannot entirely be taken away, since they are implanted by nature, and have a sure and great influence; nor can they be diminished, since, if they are evil, we ought to be without them, even though restrained and used with moderation; if they are good, we ought to use them in their completeness. But we say that they ought not to be taken away nor lessened. For they are not evil of themselves, since God has reasonably implanted them in us; but inasmuch as they are plainly good by nature,—for they are given us for the protection of life,—they become evil by their evil use. And as bravery, if you fight in defence of your country, is a good, if against your country, is an evil, so the passions, if you employ them to good purposes, will be virtues, if to evil uses, they will be called vices. Anger therefore has been given by God for the restraining of offences, that is, for controlling the discipline of subjects, that fear may suppress licentiousness and restrain audacity. But they who are ignorant of its limits are angry with their equals, or even with their superiors. Hence they rush to deeds of cruelty, hence they rise to slaughters, hence to wars. The love of gain also has been given that we may desire and seek for the necessaries of life. But they who are unacquainted with its boundaries strive insatiably to heap up riches. Hence poisoning, hence defraudings, hence false wills, hence all kinds of frauds have burst forth. Moreover, the passion of lust is implanted and innate in us for the procreation of children; but they who do not fix its limits in the mind use it for pleasure only. Thence arise unlawful loves, thence adulteries and debaucheries, thence all kinds of corruption. These passions, therefore, must be kept within their boundaries and directed into their right course, in which, even though they should be vehement, they cannot incur blame.