On the Cooperation account, philosophy and theology are understood to be different, but mutually supporting, intellectual activities. For Christian thinkers who advocate Cooperation, philosophy and theology form a coherent, mutually supportive whole. They are not in conflict with respect to their conclusions, since truth cannot contradict truth, but they differ with respect to their foundational axioms, goals, and sources of evidence. Philosophy is understood as a preamble to theology, while theology completes and fulfills philosophy. Thomas Aquinas is a foundational advocate of the Cooperation account (Summa Theologiae 1.1.1–8, Summa Contra Gentiles 1.1.1–9, Hankey 2001). Often the relationship between philosophy and theology is described in hierarchical and instrumental terms: theology draws on philosophy as needed, because philosophy is instrumentally useful to theology. According to a traditional metaphor, philosophy is the servant of theology (ancilla theologiae, literally “handmaid” of theology; see Thomas Aquinas, Summa Theologiae, 1.1.5). In a more contemporary idiom, theology uses conceptual tools provided by philosophy in the pursuit of its own distinctive intellectual task: elucidating the meaning and truth of revealed Christian doctrines.