James 3:8 - Ellicott's Commentary On The Whole Bible

But the tongue can no man tame; it is an unruly (or, restless) evil, full of deadly poison. — Mortiferous, bringer of death, like a poisoned dart or arrow; and therefore most suggestive of envenomed flights at the fame of others. St. James does not mean that no one can tame his own tongue, for so he would hardly be responsible for its vagaries; and lower down it is written expressly, “these things ought not so to be.” The hopeless savagery of the tongue, excelling the fury of wild beasts, must be that of the liar, the traducer, and blasphemer. (Comp. Psalms 140)