Charles Ellicott Commentary Romans 14:22

"The faith which thou hast, have thou to thyself before God. Happy is he that judgeth not himself in that which he approveth." — Romans 14:22 (ASV)

Do you have faith?—It is with some reluctance that, in deference to the consensus of the four best manuscripts, we abandon the Received Text here and substitute (by inserting the relative pronoun) “The faith which you have, have to yourself before God.”

That is, reserve the display of it for the privacy of your own direct communion with God, and do not display it ostentatiously in public where it may do harm.

“It is indeed”—the Apostle continues—“a happy thing to have no self-condemnatory scruples of conscience, but, on the other hand, it is fatal to have scruples and to disregard them.”

In that thing which he allows.—In the acts which he permits himself. He is a happy man who can eat what he pleases, and drink what he pleases, without any qualms of conscience to condemn him while he does so.