Accept anyone who is weak in faith, but don't argue about doubtful issues.
References for Romans 14:1
One person believes he may eat anything, but one who is weak eats only vegetables.
One who eats must not look down on one who does not eat; and one who does not eat must not criticize one who does, because God has accepted him.
Who are you to criticize another's household slave? Before his own Lord he stands or falls. And stand he will! For the Lord is able to make him stand.
References for Romans 14:4
One person considers one day to be above another day. Someone else considers every day to be the same. Each one must be fully convinced in his own mind.
Whoever observes the day, observes it to the Lord. Whoever eats, eats to the Lord, since he gives thanks to God; and whoever does not eat, it is to the Lord that he does not eat, yet he thanks God.
References for Romans 14:6