Excerpts from one of my favorites books: My Utmost for His Highest
"The teaching of the sermon on the mount is not -do your duty, but do what is not your duty. It is not your duty to go the second mile, to turn the other cheek, but Jesus says if we are His disciples we shall always do these things...
Naturally, if a man does not hit back, it is because he is a coward, but spiritually if a man does not hit back, it is a manifestation of the Son of God in him. When you are insulted you must not only not resent it, but make it an occasion to exhibit the Son of God.
To the saint, personal insult becomes the occasion of revealing the incredible sweetness of the Lord Jesus.
The disciple realizes that it is his Lord's honor that is at stake in his life and not his own." ~Oswald Chambers
Ouch and Amen!