Jakobus 3:12

Transition from the mouth to the heart. Can the fig tree, &c.--implying that it is an impossibility: as before in Jam 3:10 he had said it "ought not so to be." James does not, as Matthew (Mat 7:16-17), make the question, "Do men gather figs of thistles?" His argument is, No tree "can" bring forth fruit inconsistent with its nature, as for example, the fig tree, olive berries: so if a man speaks bitterly, and afterwards speaks good words, the latter must be so only seemingly, and in hypocrisy, they cannot be real. so can no fountain . . . salt . . . and fresh--The oldest authorities read, "Neither can a salt (water spring) yield fresh." So the mouth that emits cursing, cannot really emit also blessing.

The apostle here reproves ambition, and an arrogant magisterial tongue; and shows the duty and advantage of bridling it because of its power to do mischief. Those who profess religion ought especially to govern their tongues (Jam 3:1-12). True wisdom makes men meek, and avoiders of strife and envy: and hereby it may easily be distinguished from a wisdom that is earthly and hypocritical (Jam 3:13 to the end).