The Joy of the Lord is Your Strength!
Nehemiah 8:10 Then he said unto them, Go your way, eat the fat, and drink the sweet, and send portions unto them for whom nothing is prepared: for this day is holy unto our Lord: neither be ye sorry; for the joy of the LORD is your strength.
In such a state every duty is practicable, and every duty delightful. In such a frame of mind no man can ever fell, and in such a state of mind the general health of the body is much improved; a cheerful heart is not only a continual feast, but also a continual medicine. ~ Adam Clarke's Commentary on the Bible