The apostles preached with understanding because they had received the Holy Spirit, and were able to know and understand the true nature of Jesus. It can be said that the author of the Gospel is presenting a theological Jesus. He conveys a Jesus that he already knew and understood clearly, that he had analyzed deeply. When the apostles lived with Jesus, they still did not understand who he really was... Catechism on the New Testament, with P. Flavien Andriamirijanirina.