5 And that he, the apostle, was the very same person who had been born from the womb, that is, of the ancient substance of flesh, he does himself declare in the Epistle to the Galatians: “But when it pleased God, who separated me from my mother's womb, and called me by His grace, to reveal His Son in me, that I might preach Him among the Gentiles,” it was not, as I have already observed, one person who had been born from the womb, and another who preached the Gospel of the Son of God; but that same individual who formerly was ignorant, and used to persecute the Church, when the revelation was made to him from heaven, and the Lord conferred with him, as I have pointed out in the third book, preached the Gospel of Jesus Christ the Son of God, who was crucified under Pontius Pilate, his former ignorance being driven out by his subsequent knowledge: just as the blind men whom the Lord healed did certainly lose their blindness, but received the substance of their eyes perfect, and obtained the power of vision in the very same eyes with which they formerly did not see; the darkness being merely driven away by the power of vision, while the substance of the eyes was retained, in order that, by means of those eyes through which they had not seen, exercising again the visual power, they might give thanks to Him who had restored them again to sight. And thus, also, he whose withered hand was healed, and all who were healed generally, did not change those parts of their bodies which had at their birth come forth from the womb, but simply obtained these anew in a healthy condition.
Source: Adversus haereses (New Advent)