“And again he denied with an oath, I do not know the man.” I know that some out of a feeling of piety towards the Apostle Peter have interpreted this place to signify that Peter denied the Man and not the God, as though he meant, ‘I do not know the Man, because I know the God.’ But the intelligent reader will see that this is trifling, for if he denied not, the Lord spoke falsely when He said, “Thou shalt deny me thrice.”
[ed. note: e.g. S. Ambrose (in Luc.) says, He well denied him as man, for he knew him as God.” And S. Hilary, (in loc.) “Almost without sin did he now deny the man, who had been the first to acknowledge him as Son of God; yet seeing through infirmity of the flesh, he had at least doubted, he therefore wept bitterly when he remembered that he had not been able, even after warning, to avoid the sin of that fearfulness.”]
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).