Aquinas on the Unity of Perfect Moral Virtue and Its Significance for the Nature-Grace Question. Dissertation. Milwaukee Marquette University, 1995. Sister Renée Mirkes O.S.F, Ph.D. is a Franciscan Sister of Christian Charity Director Center for NaProEthics Ethics Division of the Pope Paul VI Institute Omaha, Nebraska 402-390-0812 http://www.popepaulvi.com/naproethics1.htm (ethics@popepaulvi.com)