Ecclesiastes 3:9 New English Translation

⁹What benefit can a worker^[a] gain from his toil?^[b]

Ecclesiastes 3:9 tn The term הָעוֹשֶׂה (haʿoseh, article plus Qal active participle ms from עָשַׂה, ʿasah, “to do”) functions substantively (“the worker”); see BDB 794 s.v. עָשַׂה II.1. This is a figurative description of man (metonymy of association), and plays on the repetition of עָשַׂה (verb: “to do,” noun: “work”) throughout the passage. In the light of God’s orchestration of human affairs, man’s efforts cannot change anything. It refers to man in general with the article functioning in a generic sense (see IBHS 244-45 §13.5.1f; Joüon 2:511 §137.m).
Ecclesiastes 3:9 sn This rhetorical question is an example of negative affirmation, expecting a negative answer: “Man gains nothing from his toil!” (see E. W. Bullinger, Figures of Speech, 949-51). Any advantage that man might gain from his toil is nullified by his ignorance of divine providence.

New English Translation (NET)