Our home group recently studied John 17 and one of our members summarized it this way:
We have a mission - to glorify God with our lives. We get to do it even if we take a few steps backward and try again to get it right. God has been at work since before the earth was made and he inserted Jesus into the long timeline of earth to give us the perfect example of how to do it - following God's instructions for our lives to the last detail like Jesus did.
Puritans summarized our mission in a similar fashion: Man's chief end
is to glorify God, and to enjoy him for ever.
Here's to doing both - living life in a way that makes God smile and invites His glory to be seen AND enjoying relationship with the one true God Almighty through His son, Jesus Christ.