21. Furthermore, the things they censured in thy Scriptures I thought impossible to be defended. And yet, occasionally, I desired to confer on various matters with someone well learned in those books, to test what he thought of them. For already the words of one Elpidius, who spoke and disputed face to face against these same Manicheans, had begun to impress me, even when I was at Carthage; because he brought forth things out of the Scriptures that were not easily withstood, to which their answers appeared to me feeble. One of their answers they did not give forth publicly, but only to us in private--when they said that the writings of the New Testament had been tampered with by unknown persons who desired to ingraft the Jewish law into the Christian faith. But they themselves never brought forward any uncorrupted copies. Still thinking in corporeal categories and very much ensnared and to some extent stifled, I was borne down by those conceptions of bodily substance. I panted under this load for the air of thy truth, but I was not able to breathe it pure and undefiled.