Epistles
Ignatius of Antioch
Ignatius of Antioch. The Apostolic Fathers, Volume 1. Lake, Kirsopp, translator. Cambridge, MA: Harvard University Press; London: William Heinemann Ltd., 1912.
They who are carnal cannot do spiritual things, neither can they who are spiritual do carnal things, just as faith is incapable of the deeds of infidelity, and infidelity of the deeds of faith. But even what you do according to the flesh is spiritual, for you do all things in Jesus Christ.
I have learnt, however, that some from elsewhere[*](Their abstinence from heresy) have stayed with you, who have evil doctrine; but you did not suffer them to sow it among you, and stopped your ears, so that you might not receive what they sow, seeing that you are as stones of the temple of the Father, made ready for the building of God our Father, carried up to the heights by the engine of Jesus Christ, that is the cross, and using as a rope the Holy Spirit. And your faith is your windlass and love is the road which leads up to God.