In the New Testament our enemies are those who harbour hostility against us, not those against whom we cherish hostility, for Jesus refuses to reckon with such a possibility. The Christian must treat his enemy as a brother, and requite his hostility with love. His behaviour must be determined not by the way others treat him, but by the treatment he himself receives from Jesus; it has only one source, and that is the will of Jesus.
Dietrich Bonhoeffer, The Cost of Discipleship
christianity, enemies, love