O vain man!— The word Κενε answers to the Syriac word Raca, Matthew 5:22 which is there condemned, when it proceeded from unjust anger, and was used by way of insult and reproach; but here it is used out of compassion and good will to the person, and as a grave and just reproof of a very dangerous error. Many words and actions may be right or wrong, according to the temper of mind, or the principles or views from which they proceed.
Related Commentaries of James 2:20
James 2:20
20 But wilt thou know, O vain man, that faith without works is dead?