c. 386–397 · John Chrysostom, Homilies on First Corinthians 9.5
Now his meaning is this: If any man have an ill life with a right faith, his faith shall not shelter him from punishment, his work being burnt up. The phrase, “shall be burned up,” means, “shall not endure the violence of the fire.” But just as if a man having golden armor on were to pass through a river of fire, he comes from crossing it all the brighter; but if he were to pass through it with hay, so far from profiting, he destroys himself besides; so also is the case in regard of men’s works. For he doth not say this as if he were discoursing of material things being burnt up, but with a view of making their fear more intense, and of shewing how naked of all defence he is who abides in wickedness. Wherefore he said, “He shall suffer loss:” lo, here is one punishment: “but he himself shall be saved, but so as by fire;” lo, again, here is a second. And his meaning is, “He himself shall not perish in the same way as his works, passing into nought, but he shall abide in the fire.