How do the ideas of Aristotle and Aquinas differ in their concept of a mixed government? For Aristotle, the mixing is to find a mean between the extremes, based on the metaphysics of the middle class. On the other hand, Aquinas chooses one characteristic from each good form of government and combines them. Are there any other dissimilarities between the two? What role does theology play in Aquinas' mixed government different from that of Aristotle's?