'Things' in the Bible

All things toil continuously; no one can ever finish describing this. The eye is never satisfied with seeing, and the ear is never filled with hearing.

{I accomplished great things}. I built for myself houses; I planted for myself vineyards.

I have seen all these things in my vain life: Sometimes a righteous man perishes in [spite of] his righteousness, and sometimes a wicked man lives a long life in [spite of] his evil.

Rejoice, O young man, in your youth, and let your heart cheer you in the days of your youth! Follow the ways of your heart and the sight of your eyes-- but know that God will bring you into judgment for all these things.

My son, be careful {about anything beyond these things}. For the writing of books is endless, and too much study {is wearisome}.