To Florus 2.57
It is irrefutably established that the apostle shows this sin to have been conveyed to descendants through conduct, not through seed. Consider, then, the great falsehood that flowed from your mouth: ‘But the apostle said “through one man,” from whom the generation of human beings certainly began, precisely to teach that original sin passed through all people by generation’ (Augustine, Marriage and Desire 2.45). In fact, the apostle said ‘through one man’ precisely so that no one would think original sin had passed through all people (Romans 5:12). Your foolishness makes it hard for me to hold back laughter: you say generation began from one human being, although both the distinction between the sexes and the reading of divine Scripture testify that generation could not occur unless two human beings—a man and a woman—had first existed.
Latin
Irrefutabiliter confectum est, peccatum illud ostendi ab Apostolo moribus ad posteros, non seminibus fuisse devectum. Quanta ergo de ore tuo effluxerit falsitas, intuere: Sed ideo " per unum hominem " Apostolus dixit, a quo generatio utique hominum coepit, ut per generationem doceret isse per omnes originale peccatum [n73] ; cum ideo Apostolus per unum hominem [n74] dixerit, ne putaretur isse per omnes originale peccatum. Ineptis ita, ut vix teneam cachinnum, qui dicis generationem ab uno homine coepisse; cum et diversitas sexuum, et lectio divina testetur, generationem non esse potuisse, nisi duo prius homines, id est vir et mulier, exstitissent.