The first question in the Westminster Shorter Catechism is 'What is the chief end of man?' What is the final purpose? What is the main thing about us? Where are we going, and what will we do when we get there? The answer is, 'To glorify God and enjoy him forever.'
Glorify. Enjoy. There are other things involved in Christian discipleship. There Psalm of Ascents have shown some of them. But it is extremely important to know the one thing that overrides everything else. The main thing is not work for the Lord; it is not suffering in the name of the Lord; it is not witnessing to the Lord; it is not teaching Sunday School for the Lord; it is not being responsible for the sake of the Lord in the community; it is not keeping the Ten Commandments; not loving your neighbour; not observing the golden rule. 'The chief end of man is to glorify God and enjoy him forever.' Or, in the vocabulary of Psalm 134, 'Bless the Lord.'
-- p. 172-173, Life At Its Best by Eugene Peterson
I didn't expect this, but it was a nice surprise. Sounds very familiar with Piper's emphasis on joy in the Lord. Our Lord is good, and there's much joy to be experienced and lived in. We can enjoy Him!
This is the end of the part 1 of Life At Its Best (and hence, the end of the book, The Long Obedience as well). How great it is to know that our Lord is a God who blesses us and who is able to receive blessings from us for He has granted us with His blessings first.