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Gregory T. Doolan provides here the first detailed consideration of the divine ideas as causal principles. He examines Thomas Aquinasa??s philosophical doctrine of the divine ideas and convincingly argues that it is an essential element of his metaphysics. According to Thomas, the ideas in the mind of God are not only principles of his knowledge, but they are productive principles as well. In this role, Goda??s ideas act as exemplars for things that he creates. As Doolan shows, this theory of exemplarism is an integral part of Thomasa??s account of the existence and order of the created universe. It also accounts in part for the freedom of Goda??s creative act. The volume begins with an introduction to Thomasa??s doctrine of exemplarism and then addresses his arguments for the existence of exemplar ideas within the mind of God. Having established the existence of divine ideas, Doolan considers how Thomas reconciles their multiplicity with Goda??s simplicity. The work identifies the various things for which Thomas posits divine ideas. As Doolan is careful to show, Thomas does not consider all of these ideas to be exemplars because not all of them act as causal principles. After identifying the ideas that do act in this way, Doolan considers how such exemplars can be causes of natural things without compromising the causality of natural agents. The volume culminates with a consideration of the role that the divine ideas play within the structure of Thomasa??s theory of participation.