The intuitions which many moral philosophers regard as the final court of appeal are the result of their upbringing—i.e. of the fact that just these level-1 principles were accepted by those who most influenced them. In discussing abortion, we ought to be doing some level-2 thinking; it is therefore quite futile to appeal to those level-1 intuitions that we happen to have acquired. It is a question, not of what our intuitions are, but of what they ought to be.

R. M. Hare, ‘Abortion and the Golden Rule’, in Essays on Bioethics, Oxford, 1999, chap. 10