Westminster Catechism:

Q. What is the chief end of man?
A. Man’s chief end is to glorify God, and to enjoy him for ever.

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John Piper:

Q. What is the chief end of man?

A. Man's chief end is to glorify God BY enjoying him for ever.

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Jesus:

"But the hour .... is now here .... when true worshipers will worship the Father in spirit and truth, for the Father is seeking such people to worship Him."  (John 4:23)