The God of the joy of my exaltation.
The Strong is the source of tremendous joy for me.
Psalms 43:4.
The joy of the believer is the same Lord. Remember that Scripture tells us for example, "Then I will go to the altar of God, to God, my joy and my delight. I will praise you with the lyre, O God, my God" (Psalms 43:4). We see then that this joy is linked to God Himself. Living in His will fills us with His joy, so the heavenly Father also said of Jesus: "this is my beloved Son, in whom I am well pleased" and this phrase also means " I have joy in my beloved Son". Why does the Father enjoy himself? Because the Son lived for His will. Jesus loved to do the will of his heavenly Father, so the joy of the Son was the joy of the Father.