Solomon
Proverbs 17:21WEB·traditional attribution

He who becomes the father of a fool grieves. The father of a fool has no joy.

Keil & Delitzsch Lutheran

Pro 17:21 The first three parts of the old Solomonic Book of Proverbs ((1) Prov 10-12; (2) 13:1-15:19; (3) 15:20-17:20) are now followed by the fourth part. We recognise it as striking the same keynote as Pro 10:1. In Pro 17:21 it resounds once more, here commencing a part; there, Pro 10:1, beginning the second group of proverbs. The first closes, as it begins, with a proverb of the fool.

John Gill Reformed Baptist

He that begetteth a fool doth it to his sorrow,.... As it proves in the issue; though it was joy to him when a man child was born, and took delight in him while in infancy and childhood, and promised himself much happiness in him when at years of discretion; but, instead of that, he departs from his education principles, despises all parental counsels and...

Matthew Henry Presbyterian

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.