Solomon
Ecclesiastes 1:16BSB·traditional attribution

I said to myself, “Behold, I have grown and increased in wisdom beyond all those before me who were over Jerusalem, and my mind has observed a wealth of wisdom and knowledge.”

Matthew Henry Presbyterian @wholebiblehenry

Solomon, having asserted in general that all is vanity, and having given some general proofs of it, now takes the most effectual method to evince the truth of it, 1. By his own experience; he tried them all, and found them vanity. 2.

Commenting on Ecclesiastes 1:12-18

John Gill Reformed Baptist @doctorgill

I communed with my own heart,.... That is, looked into it, examined it, and considered what a stock and fund of knowledge he had in it, after all his researches into it; what happiness accrued to him by it, and what judgment upon the whole was to be formed upon it; and he spoke within himself after this manner: saying, lo, I am come to...

Jamieson-Fausset-Brown Reformed @jfbcommentary

communed with . . . heart-- (Gen 24:45). come to great estate--Rather, "I have magnified and gotten" (literally, "added," increased), &c. all . . . before me in Jerusalem--namely, the priests, judges, and two kings that preceded Solomon. His wisdom exceeded that of all before Jesus Christ, the antitypical Koheleth, or "Gatherer of men," (Luk 13:34), and "Wisdom" incarnate (Mat 11:19; Mat 12:42). had . . .