Ecclesiastes 10:20 warns against cursing even in secret, expanding the theme of our own culpability in cursing that 7:22 acknowledges.

Matthew 15:19 traces slander and evil speech to the heart's corruption, revealing the inner source of the cursing we admit to in Ecclesiastes.

John 8:7-9 challenges accusers to examine their own sin before judging, directly reinforcing the self-awareness Ecclesiastes urges when we remember our own cursing.

James 3:9 highlights the inconsistency of blessing God while cursing people made in His image, deepening the guilt of the cursing we confess in Ecclesiastes.

John 8:9 shows the accusers' consciences convicting them—a vivid example of the heart knowing its own sin, just as Ecclesiastes says we know we have cursed others.