Charles Ellicott Commentary Proverbs 17:22

"A cheerful heart is a good medicine; But a broken spirit drieth up the bones." — Proverbs 17:22 (ASV)

A merry heart does good like a medicine. —Or rather, Makes good a recovery. (For the duty of religious gladness, in gratitude for the love of God towards us, compare Philippians 3:1; Philippians 4:4.)