This verse is often misinterpreted as endorsing moral relativism, where personal opinion determines right and wrong for all behaviors, even clear sins like adultery or idolatry, ignoring the context of Romans 14 which limits the principle to non-essential disputable matters like food and holy days, not universal moral commands that Scripture upholds absolutely across all believers.
Romans 14:14
King James Version (1769)
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.
Paul declares his conviction through Christ that nothing is inherently unclean, emphasizing the freedom believers have from ritual purity laws, yet he qualifies this by respecting personal convictions: if someone considers a thing unclean, it is unclean to them, underscoring the importance of conscience in matters of Christian liberty to avoid offending weaker brothers and maintain church unity.