You are my joy

Augustine writes of God, "You yourself are their joy.  Hapiness is to rejoice in you and for you and because of you."  Remind me again that joy is not based on my self . God is the only source of joy.  All REAL happiness is because of the ultimate joy which IS God.  Joy is based completely on God.  Suppose God does not GIVE us anything.  Is HE still my joy?  I hope I can make God my only joy.  Then I can allow my happiness, however it comes to me, to drive me to rejoice in God and for God and because of God.