The Preacher issues a warning to encourage moderation in moral and intellectual pursuits. The question serves as a rhetorical device to provoke reflection on the dangers of self-righteousness and intellectual pride. It aims to guide the reader away from extremes that lead to spiritual and personal destruction (Ecclesiastes 7:16).

Preacher answers the question through the declaration that follows. The Preacher responds to the reader’s warning by emphasizing balance, cautioning against extremes in righteousness or wisdom as self-destructive (Ecclesiastes 7:16). He reminds that excessive zeal or arrogance can lead to ruin, paralleling advice to avoid both wickedness and foolishness (Ecclesiastes 7:15).

The Teacher’s question ‘Why should you destroy yourself?’ confronts a specific failure mode: the person who has elevated righteousness itself into a form of self-consumption. The Hebrew תִּשּׁוֹמֵם (tishshomem, be appalled/destroy yourself) is the reflexive form of a verb that elsewhere describes devastation and ruin, here it describes what excessive self-righteousness does to the person pursuing it. Qoheleth’s counsel is not that virtue is dangerous but that the compulsion to demonstrate complete righteousness produces a kind of psychic violence against oneself. The parallel warning against excessive wickedness in verse 17 confirms this is not relativism but balance: both extremes under the sun lead to destruction. The question presses the reader to examine motivation: is the drive toward righteousness shaped by love of God and neighbor, or by the relentless need to establish one’s own standing? The former is life; the latter, as Qoheleth sees, tends toward the ruin it fears.