Since an overpopulation of wolves above the carrying capacity of the country to maintain would mean a rapid decline in the numbers of prey animals — with consequent starvation for the wolves themselves — they are forced to practice what amounts to birth control through continence.
Farley Mowat -- Never Cry Wolf
 These three beasts correspond to the triple division of sins into those of incontinence, of violence, and of fraud.
Dante Alighieri -- Dante’s Inferno
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