Parallel
Ecclesiastes 2:20
Rahlfs Septuagint (1935) · Berean Standard Bible
καὶ ἐπέστρεψα ἐγὼ τοῦ ἀποτάξασθαι τῇ καρδίᾳ μου ἐπὶ παντὶ τῷ μόχθῳ ᾧ ἐμόχθησα ὑπὸ τὸν ἥλιον
So my heart began to despair over all the labor that I had done under the sun.