Luke 6:27

But I say unto you that hear, Love your enemies, do good to them that hate you, bless them that curse you, pray for them that despitefully use you. To him that smiteth thee on the one cheek, offer also the other; and from him that taketh away thy cloak, withhold not thy coat also.

These same teachings, phrased a little differently, were recorded by Matthew in the Sermon on the Mount. For a full discussion, see my Commentary on Matthew, Matthew 5:39-45.

The principles taught here are non-resistance to evil, the overcoming of evil with good, and patient submissiveness to encroachment against one's personal rights. Ours is an era when men are screaming demands for their "rights"; but the Christian way includes the renunciation of rights, rather than the violent defense of them. It is not indicated that Christ intended such an attitude to be maintained absolutely under all conditions. The application of them to the conduct of the Christian, however, should be as extensive as possible, and much further, no doubt than is usually the case.