Man's chief end is to glorify God, and to enjoy him forever.
Psalm 90:17 (MEV)
Let the beauty of the LORD our God be upon us,
and establish the work of our hands among us;
yes, establish the work of our hands.
Psalm 92:14-15 (MEV)
They shall still bring forth fruit in old age;
they shall be filled with vitality and foliage,
to show that the LORD is upright;
He is my rock, and there is no unrighteousness in Him.