If any man among you seem to be religious, and bridleth not his tongue, but deceiveth his own heart, this man's religion is vain. Seem to be religious - The words θρησκος and θρησκεια, which we translate religious and religion, (see the next verse), are of very uncertain etymology. Suidas, under the word θρησκευει, which he translates θεοσεβει, ὑπηρετει τοις θεοις, he worships or serves the gods, accounts for the derivation thus: "It is said that Orpheus, a Thracian, instituted the mysteries (or religious rites) of the Greeks, and called the worshipping of God θρησκευειν threskeuein, as being a Thracian invention." Whatever its derivation may be, the word is used both to signify true religion, and superstition or heterodoxy. See Hesychius, and see on James 1:27 (note).
Bridleth not his tongue - He who speaks not according to the oracles of God, whatever pretences he makes to religion, only shows, by his want of scriptural knowledge, that his religion is false, ματαιος, or empty of solid truth, profit to others, and good to himself. Such a person should bridle his tongue, put the bit in his mouth; and particularly if he be a professed teacher of religion; ho matter where he has studied, or what else he has learned, if he have not learned religion, he can never teach it. And religion is of such a nature that no man can learn it but by experience; he who does not feel the doctrine of God to be the power of God to the salvation of his soul, can neither teach religion, nor act according to its dictates, because he is an unconverted, unrenewed man. If he be old, let him retire to the desert, and pray to God for light; if he be in the prime of life, let him turn his attention to some honest calling; if he be young, let him tarry at Jericho till his beard grows.