Lactantius

“ 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. ”

“ 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. ”

“ 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. ”