The bible says that if we have all virtue but lack love then we have nothing. Love is the ultimate Christian ethic.
The faithfulness of our Christian life stands or falls on if we act in love. There are many aspects of living an ethical life, but love is behind all of these elements.
"Love God and do what you please" said St. Augustine.
If we truly live our lives with a desire to please God then we are living our faith to the fullest. Christianity is about fellowship with God.
Christians have the power to change the world when the joy from our fellowship with God overflows in the world.