Shared ground
The speaker’s problem is not that work has no value at all, but that its results cannot be secured “under the sun.” He experiences his work as grief because he must hand it over to “the man who comes after” him, and he cannot control whether that person will be wise or foolish (explicit textual claims).
The passage links toil to emotional collapse: despair, sorrow-filled days, and sleepless nights (explicit textual claims). “Vanity” and “chasing after wind” frame the core point: human effort does not guarantee lasting gain or lasting control.
Where interpretation differs
Some read “I hated life” as a strong rhetorical outburst meant to underline the argument’s force; others take it as a settled verdict about life as experienced through the lens of labor “under the sun” (pressure point).
Some take “the man who comes after me” mainly as a son or direct successor; others read it more broadly as any eventual heir, administrator, or next holder of one’s assets and reputation (pressure point).
“Portion” can be heard as the inheritance share handed over, the profit of one’s work, or the net outcome one ends up with. The passage supports all three because it focuses on the transfer of what labor produced, whether goods, projects, or status (pressure point).
Why the disagreement exists
The language is compressed and emotionally charged (“hated,” “despair,” “great evil”), which can signal either hyperbole or a final conclusion. Also, the key terms (“portion,” “man after me”) have a range of ordinary meanings, and the text does not specify the successor’s relationship or the exact form of what is transferred.
What this passage clearly contributes
It sharpens Ecclesiastes’ critique of achievement by adding inheritance to the argument: even wise, skilled work can end up ruled by someone else whose quality is unknown (explicit textual claims). That loss of control makes labor feel hollow (“vanity”) and can turn work’s supposed payoff into anxiety rather than rest.
It also sets up the book’s next move (2:24–26): if work cannot function as a guarantee of lasting control, then its meaning must be sought in a different register than permanent possession or legacy. See also Ecclesiastes 2:24.