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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. There will be no spirit of--"Oh, well, I cannot do any more, I have been so misrepresented and misunderstood". . . Never look for right in the other man, but never cease to be right yourself. We are always looking for justice; the teaching of the Sermon on the Mount is--Never look for justice, but never cease to live it.

Oswald Chambers (1985). “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