 Suárez's treatment of formal causation provides a good example. He begins his treatment of the formal cause in his typical fashion, by showing it conforms to his overarching causal framework. A standard textbook account of formal causation familiar to Suárez holds simply that “form in an internal cause that gives being to a thing” (causa intrinseca quae dat esse rei: DM XII 3.3). This approach certainly comports with his basic framework for causation, at least in general terms. Suárez is, however, unwilling to adopt this formula unqualifiedly, since he thinks the other internal cause, matter, has a causal efficacy of its own, not parasitic on the causality of form. Thus, when he comes to give an account of the most significant kind of formal cause, the substantial form, he offers the following definition: