A joyful heart is good medicine, but a crushed spirit dries up the bones.
Note, 1. It is healthful to be cheerful. The Lord is for the body, and has provided for it, not only meat, but medicine, and has here told us that the best medicine is a merry heart, not a heart addicted to vain, carnal, sensual mirth; Solomon himself said of that mirth, It is not medicine, but madness; it is not food, but poison; what doth it?
A merry heart doth good like a medicine,.... Does the body good, makes it healthful and vigorous. Cheerfulness of spirit has a great influence upon the body, and much contributes to the health and welfare of it; see Ecc 9:7; and especially a heart full of spiritual joy, peace of conscience, flowing from the blood of Christ, joy in the Holy Ghost, a rejoicing in...
(Compare Pro 14:30; Pro 15:13). The effect of the mind on the body is well known. medicine--or, "body," which better corresponds with "bone." drieth--as if the marrow were exhausted.