Shared ground
Ecclesiastes 7:19–22 presents wisdom as a real kind of strength, not just a nice idea. It can steady and empower a person more effectively than concentrated civic power (“ten rulers in a city”). That is an explicit claim of the text.
The same passage immediately limits any triumphal view of wisdom. It states that no “righteous” person on earth consistently does good without sinning. So wisdom helps, but it does not turn people into flawless moral performers.
The passage then connects human moral inconsistency to everyday speech. Since people fail and speak badly, it is not wise to track and weigh “all words” that get said, especially overheard insults. The grounding reason is self-knowledge: the listener’s “knows” they have spoken similarly about others.
Where interpretation differs
A few details are debated, but they do not overturn the main point.
One question is what “ten rulers” means. Some read it as a concrete image of city leadership; others as a rounded “maximum” comparison (wisdom can outweigh the strongest normal human backing).
Another question is what “righteous” means in v.20. Some take it as “truly morally upright before God,” stressing universal sin. Others hear “righteous” as “generally decent” or “reputation for uprightness,” stressing that even the best people still fail.
A third question is how to picture the “servant” cursing. Some think of overhearing private talk (e.g., in the household); others picture direct disrespect. Either way, the issue is exposure to insulting speech that tempts retaliation.
Why the disagreement exists
The wording is brief and proverb-like, so readers must infer how literal or general the images are (“ten rulers,” the “servant”). Also, “righteous” can be used for both deep moral integrity and public uprightness, and Ecclesiastes often speaks in practical categories.
What this passage clearly contributes
It holds together two truths: wisdom is genuinely powerful for navigating life, and human goodness is never perfect. Because people fail—both in actions (“does good and doesn’t sin”) and in speech (“curse”)—the wise posture toward rumor and insult is restraint shaped by honest self-awareness rather than surprise or outrage. See also the broader biblical emphasis that speech reveals character and can harm or heal (e.g., Proverbs 12:18).