Solomon
Proverbs 10:23ESV·traditional attribution

Doing wrong is like a joke to a fool, but wisdom is pleasure to a man of understanding.

Matthew Henry Presbyterian @wholebiblehenry

Here is, 1. Sin exceedingly sinful: It is as laughter to a fool to do mischief; it is as natural to him, and as pleasant, as it is to a man to laugh. Wickedness is his Isaac (that is the word here); it is his delight, his darling, and that in which he pleases himself. He makes a laughing matter of sin.

John Gill Reformed Baptist @doctorgill

It is as sport to a fool to do mischief,.... To do any injury to the persons and properties of men; which shows a most wicked and malicious spirit, a very depraved nature indeed: or rather "to commit sin" (o) of any sort, which he has devised in his own heart; it is as a "laughing" (p), as the words may be rendered; it is...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Sin is the pleasure of the wicked; wisdom that of the good.