First part Four isses are discussed, namely: 1) The origin of idolatry; 2) The multiplication of the names of the gods; 3) The role of exterior acts (opera exteriora) in the worship of God; 4) Whether it is possible to venerate a rightful dead before his/her canonization. Second part Nine possible mistakes of Christians concerning God (and his behaviour). The last one it is against the idea that after the baptism one would be forgiven for any sin and it is followed by a long exemplum taken from the life of Basil about the necessity of contrition.