Man's chief end is to glorify God and to enjoy Him forever.1
Scripture
1 Corinthians 10:31[1]
So, whether you eat or drink, or whatever you do, do all to the glory of God. (ESV)
Psalm 73:25–26[1]
Whom have I in heaven but you?
And there is nothing on earth that I desire besides you.
My flesh and my heart may fail,
but God is the strength of my heart and my portion forever. (ESV)