He that begetteth a fool doeth it to his sorrow: and the father of a fool hath no joy.

Jamieson-Fausset-Brown Bible Commentary

21. (Compare Pr 23:24). Different words are rendered by "fool," both denoting stupidity and impiety.

Matthew Henry's Concise Commentary

17:19. If we would keep a clear conscience and a quiet mind, we must shun all excitements to anger. And a man who affects a style of living above his means, goes the way to ruin. 20. There is nothing got by ill designs. And many have paid dear for an unbridled tongue. 21. This speaks very plainly what many wise and good men feel very strongly, how grievous it is to have a foolish, wicked child. 22. It is great mercy that God gives us leave to be cheerful, and cause to be cheerful, if by his grace he gives us hearts to be cheerful. 23. The wicked are ready to part with their money, though loved, that they may not suffer for their crimes. 24. The prudent man keeps the word of God continually in view. But the foolish man cannot fix his thoughts, nor pursue any purpose with steadiness. 25. Wicked children despise the authority of their father, and the tenderness of their mother. 26. It is very wrong to find fault for doing what is duty. 27,28. A man may show himself to be a wise man, by the good temper of his mind, and by the good government of his tongue. He is careful when he does speak, to speak to the purpose. God knows his heart, and the folly that is bound there; therefore he cannot be deceived in his judgment as men may be.

Matthew Henry's Whole Bible Commentary

Verse 21

This expresses that very emphatically which many wise and good men feel very sensibly, what a grievous vexatious thing it is to have a foolish wicked child. See here, 1. How uncertain all our creature-comforts are, so that we are often not only disappointed in them, but that proves the greatest cross in which we promised ourselves most satisfaction. There was joy when a man-child was born into the world, and yet, if he prove vicious, his own father will wish he had never been born. The name of Absalom signifies his father's peace, but he was his greatest trouble. It should moderate the desire of having children, and the delights of their parents in them, that they may prove a grief to them; yet it should silence the murmurings of the afflicted father in that case that if his son be a fool he is a fool of his own begetting, and therefore he must make the best of him, and take it up as his cross, the rather because Adam begets a son in his own likeness. 2. How unwise we are in suffering one affliction (and that of an untoward child as likely as any other) to drown the sense of a thousand mercies: The father of a fool lays that so much to heart that he has no joy of any thing else. For this he may thank himself; there are joys sufficient to counterbalance even that sorrow.