and I applied my mind to search and investigate in wisdom all things that are done under the sun. A bad business God has given to human beings to be busied with.
those all alone with no companion, with neither child nor sibling—with no end to all their toil, and no satisfaction from riches. For whom do I toil and deprive myself of good things? This also is vanity and a bad business.
I turned my heart toward knowledge; I sought and pursued wisdom and its design, and I recognized that wickedness is foolishness and folly is madness. Critique of Advice on Women.
All these things I saw and I applied my heart to every work that is done under the sun, while one person tyrannizes over another for harm. The Problem of Retribution.