Proverbs 15:13 directly parallels glad heart versus sorrow, reinforcing the same teaching as Proverbs 15:15.

Proverbs 17:22 directly parallels the cheerful heart as medicine and a crushed spirit as harmful—same contrast.

Proverbs 12:25 contrasts anxiety with a good word bringing gladness, paralleling Proverbs 15:15's affliction vs cheerfulness.

Acts 16:25 shows Paul and Silas in prison singing hymns—a living example of a cheerful heart amid afflicted days.

Romans 5:3 directly states rejoicing in sufferings—the exact paradox of a cheerful heart during afflicted days.

Romans 12:12 combines rejoicing in hope with patience in tribulation—mirroring the cheerful heart even in affliction.

In 2 Corinthians 6:10, being sorrowful yet always rejoicing mirrors the cheerful heart despite affliction in Proverbs 15:15.

In 1 Peter 1:6-8, rejoicing despite trials directly parallels the cheerful heart in afflicted days of Proverbs 15:15.

In 1 Peter 4:13, rejoicing in suffering echoes the cheerful heart amidst affliction from Proverbs 15:15.

In Genesis 47:9, Jacob's description of his years as 'few and unpleasant' exemplifies the afflicted person's evil days.

Psalm 90:7-9 depicts life consumed by God's anger and misery—the same affliction the proverb calls evil.