Book III. In the Shape of a Letter Addressed to the Same Marcellinus. In which Augustin refutes some errors of Pelagius on the question of the merits of sins and the baptism of infants—being sundry arguments of his which he had interspersed among his expositions of Saint Paul, in opposition to original sin. To his beloved son Marcellinus, Augustin, bishop and servant of Christ and of the servants of Christ, sendeth greeting in the Lord.