In Ecclesiastes 8:16, the Teacher again says he applied his heart to know wisdom—reinforcing the personal reflection begun in 8:9.

In Ecclesiastes 1:14, the same observation that all is vanity under the sun — reinforcing the futility of human lordship.

Ecclesiastes 5:8 directly addresses oppression and hierarchy — exactly the 'man lords it over man' situation observed here.

Ecclesiastes 7:25 also describes applying the heart to seek understanding — mirroring the investigative approach here.

In Ecclesiastes 1:13, the Teacher first says he applied his heart to wisdom—this earlier statement is echoed here, forming a bookend to his observations.

Ecclesiastes 5:13 uses the same phrase 'to his hurt' about riches harming their owner — a parallel instance of self-destructive behavior.

In Ecclesiastes 3:10, the same 'I have seen' formula applied to human labor — here applied to oppressive rule.

In Exodus 14:28, Pharaoh's army is destroyed as he pursues Israel—a clear example of a ruler's oppression boomeranging to his own hurt.

In 2 Kings 14:10-12, Amaziah's pride after victory provokes a challenge and causes his own defeat—a direct parallel to a ruler's self-destructive power.

Exodus 14:5 recounts Pharaoh's oppressive rule over Israel — a concrete example of man lording it over man to their hurt.

In Deuteronomy 2:30, Sihon's stubborn refusal leads to his defeat—another instance of a king's opposition bringing harm on himself.