Origen

“ Yes; for to do harm to a man is the same as to do him injustice.’ ‘You speak truly. We must then not do injustice in return for injustice, nor must we do evil to any one, whatever evil we may have suffered from him.’ Thus Plato speaks; and he adds, ‘Consider, then, whether you are at one with me, and whether, starting from this principle, we may not come to the conclusion that it is never right to do injustice, even in return for an injustice which has been received ”