Have you faith? have it to yourself before God. Happy is he that condemns not himself in that thing which he allows.
All Commentaries on Romans 14:22 Go To Romans 14
John Chrysostom
AD 407
It seems to me that here Paul is gently warning the stronger ones against the temptation of vanity. He does not want them to go around boasting of their superiority but to be happy with having a clear conscience.