His joy is the fruit of obedience wrought out by His Spirit unto the death of self. The sinful flesh and wounded soul blocks the flow of His Spirit.
ONCE SELF IS CRUCIFIED AND THE BROKENNESS OF THE SOUL IS HEALED,
HIS FOUNTAIN OF JOY ERUPTS WITHIN.
When you have been fully conquered by the King then the righteousness, peace and joy of this King, WHICH IS THE KINGDOM OF GOD, becomes your forever increasing EXPLOSIVE portion.