Adam Clarke on James 2:17

If it hath not works, is dead - The faith that does not produce works of charity and mercy is without the living principle which animates all true faith, that is, love to God and love to man. They had faith, such as a man has who credits a well-circumstanced relation because it has all the appearance of truth; but they had nothing of that faith that a sinner, convinced of his sinfulness, God's purity, and the strictness of the Divine laws, is obliged to exert in the Lord Jesus, in order to be saved from his sins.