Humilitas (humility) is indeed a very special virtue in St. Thomas' virtue ethics. Its particularity lies in the fact that humility, which refers to the relationship between God and man, is placed under the rule of moral virtues (namely, humility is a part of temperance). Humility, therefore, has a dual identity: it possesses elements of theological virtue and simultaneously is subordinated to moral virtue. Finally, under the construction of St. Thomas, humility was incorporated into the system of Aristotle's virtue theory. In other words, St. Thomas has successfully "grafted" a typical virtue that originally belongs to Christianity onto the system of virtue theory which is established by Aristotle. In a broader sense, St. Thomas, through the concept of humilitas, is telling us that Aristotle's virtue theory and Christian virtue theory can be reconciled.