Existential fulfilment: A child finding he has legs and using them , in delight, to run. (Psalm 19 champion) Intimacy: The joy of a man going to see a dear friend. Or more the joy of a man going to see his lover. The delight that a women finds in spending time with her husband. (Psalm 19 bridegroom)
These are both fulfilled in the greatest command: Love the LORD your God with all Your heart and soul and mind. Do what you were made to do, you were made for intimacy.
On the rock of God is a bed of piece. Out of it shoots the stem of faith budding in the blossoms of Joy. In time this yields the fruit of the Spirit.