When Julian addressed his two letters to Zosimus he was preparing a reply to the first of Augustine's two books "de Nuptiis et Concupiscentia", which he addressed to a fellow-recusant named Turbantius, whose prayers he earnestly asks that the church may be delivered from the defilement of Manicheism. He sent some extracts from the work, which was in four books, and apparently entitled "Contra eos qui nuptias damnant et fructus earum diabolo assignant", to Valerius, who forwarded them to his friend Augustine, who at once rejoined in a second book "de Nuptiis et Concupiscentia". When Julian's work subsequently came into his hands, Augustine published a fuller rejoinder in his "contra Julianum Pelagianum". Augustine freely quotes his antagonist, and Julian again insisted upon the Manicheism of his opponents; again charged Zosimus with prevarication, and elaborated the whole anthropology for which he contended.