John Chrysostom
"Lovers of pleasure rather than lovers of God, having a form of piety, but denying its power." So also in the Epistle to the Romans the Apostle says: "Having in the law the form of knowledge and truth" (Rom 2:20).
But there he speaks in praise, while here he presents this as the gravest sin of all defects. Why? Because he does not use the same word in the same sense.
By the word form he sometimes expresses likeness, and sometimes something soulless and insignificant. For example, in the Epistle to the Corinthians he himself says: "A man ought not to cover his head, since he is the image and glory of God" (1 Cor 11:7).
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And the prophet says: "Man walks like a shadow" (Ps 38:7). Likewise, by the word lion Scripture sometimes expresses royal dignity: "He crouched as a lion, and as a lioness; who shall rouse him?" (Gen 49:9).
At other times it expresses rapacity: "Like a lion greedy for prey and roaring" (Ps 21:14). We do the same. Since things are complex and varied, they are rightly portrayed by many examples and likenesses.
For example, when we wish to praise a beautiful woman, we compare her to a painting. When we wish to praise a painting, we affirm that it speaks and explains itself.
But in these cases we do not do the same thing. In the first, we express that the woman comes close to an image. In the second, we express that the image comes close to beauty.
So also by the word form the Apostle there expresses a pattern, image, teaching, and archetype of piety. Here he expresses something soulless and dead, a mere exterior, appearance, and hypocrisy.
Therefore faith without works is only an outward appearance without power, and rightly so. As a beautiful and blooming body that has no strength is like a painted image, so also is right faith without works.
Let us suppose that some lover of money, traitor, or insolent man holds the right faith. What benefit is there if he has nothing fitting for a Christian?
What benefit if he does nothing proper to piety, but surpasses the pagans by his impiety? What benefit if he becomes an infection to those near him and an occasion for blasphemy against God?
What benefit if he disgraces the teaching by his deeds? "From such," says the Apostle, "turn away."
But if such people will exist in the last times, how does he say, "From such turn away"? Probably there were some such people even then, though not impious to such a degree.
It is beyond doubt that through Timothy he exhorts everyone to turn away from such people.