Matthew Poole and continuators on James 3:8

8 But the tongue can no man tame : it is an unruly evil , full of deadly poison .

Not only other Men's Tongues, but not his own.

No Man of himself, and without the Assistance of Divine Grace, can bring his Tongue into Subjection, and keep it in order; nor can any. Man by the Assistance of any Grace promised in this Life, so keep it, as that it shall never at all offend.

Or, which cannot be restrained, and kept within Bounds: Wild Beasts are kept in by Grates and Bars, but this by no Restraint.

The Wickedness of the Tongue is compared to Poison▪ in respect of the Mischief it doth to others. It seems to allude to those kind of Serpents which have Poison under their Tongues, Psalm 140.3. with which they kill those they bite. The Poison of the Tongue is no less deadly, it murders Men's Reputations by the Slanders it utters, their Souls by the Lust, and [illegible: 1 letter]assions it stirs up in them, and many times their Bodies too by the Contentions and Quarrels it raiseth against Men.