Isagoge ad lectionem epistolarum divi Pauli apostoli, qua compositionis oeconomia, et germana dispositio indicatur. Opusculum recens. Benedicto Aretio authore.

Augustine.

The opinion of Augustine is that this name came to him because of his changed religion, which he shares with Ambrose: Ambrose. This is also probable, since even today the Jews change their names with their religion. But against this, in our Apostle, it is objected that after his change of religion he is still called Saul twice, but this is not without reason. For the Holy Spirit names him Saul among the Jews, and now, finally, he is to be segregated for the ministry of the Church of the Gentiles: thence Luke conveniently moves to the name of Paul; he says, Saul, who is also Paul, thus he passed from the old name to the new,