14 I know, and am persuaded by the Lord Jesus, that there is nothing unclean  of itself: but to him that esteemeth any thing to be unclean, to him it is unclean.
14 I am convinced, being fully persuaded in the Lord Jesus, that nothing is unclean in itself. But if anyone regards something as unclean, then for that person it is unclean.
14 I know and am persuaded in the Lord Jesus that nothing is unclean in itself, but it is unclean for anyone who thinks it unclean.
14 I'm convinced - Jesus convinced me! - that everything as it is in itself is holy. We, of course, by the way we treat it or talk about it, can contaminate it.
14 I know and am convinced by the Lord Jesus that there is nothing unclean of itself; but to him who considers anything to be unclean, to him it is unclean.
14 I know and am convinced on the authority of the Lord Jesus that no food, in and of itself, is wrong to eat. But if someone believes it is wrong, then for that person it is wrong.
Matthew Henry's Commentary on Romans 14:14
Commentary on Romans 14:14-18
(Read Romans 14:14-18)
Christ deals gently with those who have true grace, though they are weak in it. Consider the design of Christ's death: also that drawing a soul to sin, threatens the destruction of that soul. Did Christ deny himself for our brethren, so as to die for them, and shall not we deny ourselves for them, so as to keep from any indulgence? We cannot hinder ungoverned tongues from speaking evil; but we must not give them any occasion. We must deny ourselves in many cases what we may lawfully do, when our doing it may hurt our good name. Our good often comes to be evil spoken of, because we use lawful things in an uncharitable and selfish manner. As we value the reputation of the good we profess and practise, let us seek that it may not be evil-spoken of. Righteousness, peace, and joy, are words that mean a great deal. As to God, our great concern is to appear before him justified by Christ's death, sanctified by the Spirit of his grace; for the righteous Lord loveth righteousness. As to our brethren, it is to live in peace, and love, and charity with them; following peace with all men. As to ourselves, it is joy in the Holy Ghost; that spiritual joy wrought by the blessed Spirit in the hearts of believers, which respects God as their reconciled Father, and heaven as their expected home. Regard to Christ in doing our duties, alone can make them acceptable. Those are most pleasing to God that are best pleased with him; and they abound most in peace and joy in the Holy Ghost. They are approved by wise and good men; and the opinion of others is not to be regarded.