Suppose that I stand firmly in what Alasdair MacIntyre describes as the Thomistic tradition of moral enquiry. I try my best to recover a historical understanding of Aquinas's teachings, and I refuse to let my philosophical opponents set the terms of debate. Now suppose that you yourself are one of my opponents: a Buddhist, a Jew, a Muslim or perhaps a secular humanist. (It makes no difference whether or not you believe in God, just so long as whatever theological commitments you might have diverge sharply from my own.) Finally, suppose that I have always found you a considerate neighbour, a friendly and responsible colleague, and a reliable contributor to worthy causes: you run the neighbourhood recycling programme, do volunteer work at an AIDS hospice, and serve as den mother of your son's Cub Scout troop. All of my experience suggests that you are, by commonly accepted standards, morally admirable; but you don't believe in God, or at least your own understanding of God and God's law differs significantly from my own. Am I, as a loyal Thomist, able to acknowledge your virtues? Or must I dismiss them all as merely apparent?