Dallas Willard on God’s joy:
He is full of joy. Undoubtedly he is the most joyous being in the universe. The abundance of his love and generosity is inseparable from his infinite joy. All of the good and beautiful things from which we occasionally drink [Willard includes the sea in all its beauty, or a wonderful movie, or music] … God continuously experiences in all their breadth and depth and richness.
(as quoted in Waking the Dead by John Eldredge, pg 210)