Gregory the Dialogist

And again he says: "For if he who comes preaches another Christ whom we have not preached, or ye receive another spirit that ye have received not, or another gospel which ye have not obtained, ye will rightly be kept back."

Let us consider how Paul had denied himself, who said: "Yet I live, now not I." For that savage persecutor had been extinguished, and the devout preacher had begun to live. For if he himself were still that same person, he would certainly not be devout. But let him who denies that he lives say from where it is that he proclaims holy words through the teaching of truth. He immediately adds: "But Christ lives in me." As if he were saying openly: I indeed have been extinguished from myself because I do not live carnally; yet I have not died essentially because I live spiritually in Christ.