The righteousness of faith

Romans 14 ¹⁹Let us therefore follow after the things which make for peace, and things wherewith one may edify another. ²⁰For meat destroy not the work of God. All things indeed are pure; but it is evil for that man who eateth with offence. ²¹It is good neither to eat flesh, nor to drink wine, nor any thing whereby thy brother stumbleth, or is offended, or is made weak. ²²Hast thou faith? have it to thyself before God. Happy is he that condemneth not himself in that thing which he alloweth.
²³And he that doubteth is damned if he eat, because he eateth not of faith: for whatsoever is not of faith is sin.