Tertullian

“ Therefore because, in the eagerness of his zeal against Judaism as a neophyte, he thought that there was something to be blamed in their conduct—even the promiscuousness of their conversation [2] —but afterwards was himself to become in his practice all things to all men, that he might gain all,—to the Jews, as a Jew, and to them that were under the law, as under the law,—you would have his censure, which was merely directed against conduct destined to become acceptable even to their accuser, suspected of prevarication against God on a point of public doctrine. ”

“ Now, if even the Creator had so long before discarded all these things, and the apostle was now proclaiming them to be worthy of renunciation, the very agreement of the apostle’s meaning with the decrees of the Creator proves that none other God was preached by the apostle than He whose purposes he now wished to have recognised, branding as false both apostles and brethren, for the express reason that they were pushing back the gospel of Christ the Creator from the new condition which the Creator had foretold, to the old one which He had discarded. ”