23 And he that doubteth  is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin.
23 But whoever has doubts is condemned if they eat, because their eating is not from faith; and everything that does not come from faith is sin.
23 But whoever has doubts is condemned if he eats, because the eating is not from faith. For whatever does not proceed from faith is sin.
23 But if you're not sure, if you notice that you are acting in ways inconsistent with what you believe - some days trying to impose your opinions on others, other days just trying to please them - then you know that you're out of line. If the way you live isn't consistent with what you believe, then it's wrong.
23 But he who doubts is condemned if he eats, because he does not eat from faith; for whatever is not from faith is sin.
23 But if you have doubts about whether or not you should eat something, you are sinning if you go ahead and do it. For you are not following your convictions. If you do anything you believe is not right, you are sinning.
Matthew Henry's Commentary on Romans 14:23
Commentary on Romans 14:19-23
(Read Romans 14:19-23)
Many wish for peace, and talk loudly for it, who do not follow the things that make for peace. Meekness, humility, self-denial, and love, make for peace. We cannot edify one another, while quarrelling and contending. Many, for meat and drink, destroy the work of God in themselves; nothing more destroys the soul than pampering and pleasing the flesh, and fulfilling the lusts of it; so others are hurt, by wilful offence given. Lawful things may be done unlawfully, by giving offence to brethren. This takes in all indifferent things, whereby a brother is drawn into sin or trouble; or has his graces, his comforts, or his resolutions weakened. Hast thou faith? It is meant of knowledge and clearness as to our Christian liberty. Enjoy the comfort of it, but do not trouble others by a wrong use of it. Nor may we act against a doubting conscience. How excellent are the blessings of Christ's kingdom, which consists not in outward rites and ceremonies, but in righteousness, peace, and joy in the Holy Ghost! How preferable is the service of God to all other services! and in serving him we are not called to live and die to ourselves, but unto Christ, whose we are, and whom we ought to serve.