…sea, as I lie willing and naked, The merriment of the twin babes that crawl over the grass in the sun, the mother never turning her vigilant eyes from them, The walnut-trunk, the walnut-husks, and the ripening or ripen’d long-round walnuts, The continence of vegetables, birds, animals, The consequent meanness of me should I skulk or find myself indecent, while birds and animals never once skulk or find themselves indecent, The great chastity of paternity, to match the great chastity of…
There are no more uses of "incontinence" in the book.
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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.