Book III.
Augustin goes on to refute other matters which are calumniously objected by the Pelagians in the same letter sent to Thessalonica; and expounds, in opposition to their heresy, what those who are truly Catholic say concerning the utility of the law; what they teach of the effect and virtue of baptism; what of the discrepancy between the two Testaments, the Old and the New; what concerning the righteousness and perfection of the prophets and apostles; what of the appellation of sin in Christ, when He is said in the likeness of sinful flesh concerning sin to have condemned sin, or to have become sin; and finally, what they profess concerning the fulfilment of the commandments in the future life.
LIBER TERTIUS.
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Pergit refutare caetera quae calumniose a Pelagianis in eadem Epistola Thessalonicam missa objectantur; exponitque contra eorum haeresim quid vere Catholici dicant de Legis utilitate, quid de Baptismi effectu et virtute doceant, quid de utriusque Testamenti, veteris ac novi discrepantia, quid de Prophetarum et Apostolorum justitia et perfectione, quid de peccati in Christo appellatione, cum in similitudine carnis peccati de peccato damnasse peccatum dicitur, vel factus ipse peccatum; quid postremo de praeceptorum in futura vita impletione profiteantur.