Reinhold Niebuhr, approaching the ethical field as a theologian rather than as a philosopher, has maintained that the Christian ethic is not single and indivisible, but that, on the contrary, it consists of what one might call an absolute ethic (‘the law of love’) and a kind of interim ethic in which the notion of justice is prominent. Without commenting on Niebuhr's work I wish to put forward a view which, although more general than his, is perhaps not without a superficial resemblance to it.