For it is an ordinance of nature that nothing great can be achieved in a moment, and that all the fairest tasks are attended with difficulty, while on births as well she has imposed this law, that the larger the animal, the longer should be the period of gestation.
Nihil enim rerum ipsa natura voluit magnum effici cito, praeposuitque pulcherrimo cuique operi difficultatem: quae nascendi quoque hanc fecerit legem, ut maiora animalia diutius visceribus parentis continerentur.
Original text (Latin)
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Notes from Wikiquote
Book X, Chapter III, 4; translation by H. E. Butler | Compare: Natura non facit saltus