Verse 13. - The beginning of the words of his mouth is foolishness. A confirmation of the last clause of the preceding verse. The fool speaks according to his nature. "As saith the proverb of the ancients, Out of the wicked cometh forth wickedness" (1 Samuel 24:13; cutup. Proverbs 15:2; Isaiah 32:6). As soon as he opens his month he utters folly, unwisdom, silliness. But he does not stop there. The end of his talk is mischievous madness. By the time he has finished, he has committed himself to statements that are worse than silly, that are presumptuous, frenzied, indicative of mental and moral depravity. Intemperate language about the secrets of God's providence and the moral government of the world may be intended. Some think that the writer is still alluding to dangerous talk concerning a tyrannical ruler, seditious proposals, secret conspiracies, etc. The text itself does not confirm such notion with any certainty.

10:11-15 There is a practice in the East, of charming serpents by music. The babbler's tongue is an unruly evil, full of deadly poison; and contradiction only makes it the more violent. We must find the way to keep him gentle. But by rash, unprincipled, or slanderous talk, he brings open or secret vengeance upon himself. Would we duly consider our own ignorance as to future events, it would cut off many idle words which we foolishly multiply. Fools toil a great deal to no purpose. They do not understand the plainest things, such as the entrance into a great city. But it is the excellency of the way to the heavenly city, that it is a high-way, in which the simplest wayfaring men shall not err, Isa 25:8. But sinful folly makes men miss that only way to happiness.The beginning of the words of his mouth is foolishness,.... As soon as ever he opens his mouth, he betrays his folly; the first word he speaks is a foolish one; or it is from the abundant folly in his heart that he speaks, which is the source and spring of all his foolish talk;

and the end of his talk is mischievous madness; to himself and others; as he goes on, he appears more and more foolish, and yet more confident of his own wisdom; and is resolutely set on having his own way and will; grows warm, and is violently hot, to have his own words regarded; and, if contradicted, is like a madman, scattering arrows, firebrands, and death; his talk from first to last is a circle of folly; and, though it begins with something weak, and may seem innocent, yet it ends and issues in wickedness and madness, in rage and wrath, in oaths and curses.