The reality is that Christians are a people set apart unto the Lord and called to honor the Lord as His redeemed people. This notion of living for another being is something that just is so contrary to worldly wisdom. The world desires that we live out and have our best life right now. So, why would we seek to honor the Lord and live for Him instead of self? How is living for the Lord something is actually a way more gratifying way to live than living for self?