  A vivid example of the way Aquinas moves from an Augustinian to an Aristotelian framework occurs in his Treatise on Human Nature (Summa theologiae 1a 75–89), where he considers the Augustinian claim that “pure truth should not be looked for from the senses of the body” (84.6 obj. 1). In reply, Aquinas invokes the Aristotelian agent intellect: