Proverbs 15:13 (NKJV) A merry heart makes a cheerful countenance, But by sorrow of the heart the spirit is broken.
Proverbs 15:15 (NKJV) All the days of the afflicted are evil, But he who is of a merry heart has a continual feast.
Proverbs 17:22 (KJV) A merry heart doeth good like a medicine: but a broken spirit drieth the bones.
'Tis easy enough to be pleasant,
When life flows along like a song;
But the man worthwhile is the one who will smile
When everything goes dead wrong.
Ella Wheeler (1855-1919) Draper's Book of Quotations for the Christian World.