The precepts Love your enemies, do good to them which hate you, bless them that curse you … are born from the Gospel's profound spirit of individualism, which refuses to let one's own actions and conduct depend in any way on somebody else's acts. The Christian refuses to let his acts be mere reactions—such conduct would lower him to the level of his enemy. The act is to grow organically from the person, as the fruit from the tree. … What the Gospel demands is not a reaction which is the reverse of the natural reaction, as if it said: Because he strikes you on the cheek, tend the other —but a rejection of all reactive activity, of any participation in common and average ways of acting and standards of judgment.

L. Coser, trans. (1961), pp. 99-100 - Das Ressentiment im Aufbau der Moralen (1912)