Solomon
Ecclesiastes 9:3BSB·traditional attribution

This is an evil in everything that is done under the sun: There is one fate for everyone. Furthermore, the hearts of men are full of evil and madness while they are alive, and afterward they join the dead.

Matthew Henry Presbyterian @wholebiblehenry

It has been observed concerning those who have pretended to search for the philosophers' stone that, though they could never find what they sought for, yet in the search they have hit upon many other useful discoveries and experiments. Thus Solomon, when, in the close of the foregoing chapter, he applied his heart to know the work of God, and took a great deal of...

Commenting on Ecclesiastes 9:1-3

John Gill Reformed Baptist @doctorgill

This is an evil among all things that are done under the sun, that there is one event unto all,.... A very great evil, a very sore one, the worst of evils. Not an evil, as the providence of God is concerned with it, who does no evil; nor is there any unrighteousness in him; he is righteous in all his ways: but this is...

Jamieson-Fausset-Brown Reformed @jfbcommentary

Translate, "There is an evil above all (evils) that are done," &c., namely, that not only "there is one event to all," but "also the heart of the sons of men" makes this fact a reason for "madly" persisting in "evil while they live, and after that," &c., sin is "madness." the dead-- (Pro 2:18; Pro 9:18).