To Florus 1.9

His first book, then, the only one published before this, accuses us of being new heretics (Augustine, On Marriage and Concupiscence 1.1). The reason is that we oppose an opinion which, like the whitewashed tomb of the Gospel, is covered outwardly with a clean surface but packed with filth and wickedness within (Matthew 23:27). Under the guise of praising baptism, it belches out the filth of the Manichaeans and sin inherent in nature, contaminating the catholic Church's sacraments, which until now have been pure.