A merry heart doeth good like a medicine: but a broken spirit drieth the bones.
– Proverbs 17:22
The word for merry means glad, or joyful. The word for medicine means a cure, or healing. The word for heart generally means the mind as elsewhere in Proverbs. Our state of mind affects the state of our bodies (Proverbs 14:30). This can be reflected in more severe cases of dealing with diseases, but also in ongoing cases of poor health. There is “a time to laugh” (Ecclesiastes 3:4), in other words, a time and place for lightheartedness. The lifting of spirits can come in various ways, but it is beneficial (Proverbs 12:25; 15:13; 18:14). Fat bones are an image of health and vitality (Proverbs 3:8; 15:30; 16:24). Dry bones are obviously the opposite picture.