We conclude therefore that a Christian man does not live in himself, but in Christ and in his neighbor, or else is no Christian; in Christ by faith, in his neighbor by love. By faith he is carried upwards above himself to God, and by love he sinks back below himself to his neighbor, still always abiding in God and His love…
–Martin Luther
The Greatest Command: Love God with all that you are and have.
2nd Greatest Command: Love your neighbor as yourself.