Westminster Larger Catechism (Q1)
Q. 1. What is the chief and highest end of man?
A. Man's chief and highest end is to glorify God, and fully to enjoy him forever.
What does this mean for me?
I was not created for myself, therefore my purposes in life should not revolve around me. I was not created for my comforts, my successes, my dreams, my aspirations, my career, my family, my friends, or even my ministry. I was created for the Glory of God. Since that is my chief purpose, I should submit all areas of my life to God and for that purpose.
Since God is the greatest good in the universe, living for His glory will also bring the greatest enjoyment of this life and the next.