Solomon
Proverbs 15:15ESV·traditional attribution

All the days of the afflicted are evil, but the cheerful of heart has a continual feast.

Matthew Henry Presbyterian @wholebiblehenry

See here what a great difference there is between the condition and temper of some and others of the children of men. 1. Some are much in affliction, and of a sorrowful spirit, and all their days are evil days, like those of old age, and days of which they say they have no pleasure in them. They eat in darkness (Ecc 5:17) and never eat with pleasure, Job 21:25.

John Gill Reformed Baptist @doctorgill

All the days of the afflicted are evil,.... And some are afflicted all their days, from their youth up; so that not only the days of old age are evil days, in which they have no pleasure, but even the days of their youth; all their days, as Jacob says, "few and evil have the days of the years of my life been", Gen 47:9...

Jamieson-Fausset-Brown Reformed @jfbcommentary

The state of the heart governs the outward condition. evil--sad, contrasted with the cheerfulness of a feast.