Christian hedonism is the truth that, “God is most glorified in us when we are most satisfied in Him.” John Piper in Desiring God: Mediations of a Christian Hedonist explains further:
We praise what we enjoy because the delight is incomplete until it is expressed in praise. If we were not allowed to speak of what we value and celebrate what we love and praise what we admire, our joy would not be full. So if God loves us enough to make our joy full, He must not only give us Himself; He must also win from us the praise of our hearts—not because He needs to shore up some weakness in Himself or compensate for some deficiency, but because He loves us and seeks the fullness of our joy that can be found only in knowing and praising Him, the most magnificent of all Beings, (pg. 49).
This is also expressed at the beginning of The Westminster Shorter Catechism when it asks, what is the chief end of man? “Man’s chief end is to glorify God and enjoy Him forever.” When we enjoy Him, He is glorified in us.