Ecclesiastes 7:2-6 expands on why laughter is madness — sorrow is better than mirth, and fools' laughter is vanity.

Ecclesiastes 7:6 compares foolish laughter to crackling thorns, reinforcing the same verdict that it is pointless vanity.

Proverbs 14:13 confirms that laughter can mask heartache and joy ends in grief — aligning with the dismissal of laughter as madness.

Isaiah 22:13 depicts the 'eat and drink for tomorrow we die' attitude—exactly the kind of pleasure Ecclesiastes 2:2 calls madness.

Luke 6:25 pronounces woe on those who laugh now, aligning with Ecclesiastes' view that such laughter is mad and futile.

James 4:9 calls for laughter to be turned to mourning, directly supporting Ecclesiastes' dismissal of frivolous pleasure.

Amos 6:3-6 condemns those who indulge in luxury while ignoring ruin, similar to Ecclesiastes' critique of meaningless pleasure.

1 Samuel 25:36 shows Nabal's drunken merriment leading to disaster, illustrating the foolishness Ecclesiastes calls madness.

1 Peter 4:2-4 warns against sensuality and excess, echoing Ecclesiastes' view that such pleasure accomplishes nothing.