Wang Yangming 王陽明 (1472 – 1529) is famously associated with the view that knowledge and action are unified (zhī xíng hé yī 知行合一). Call this the Unity Thesis. Given standard assumptions about what it means for a person to know, it may seem that the Unity Thesis is clearly false: I can know that p without currently acting in p-related ways, and I can know how to φ without currently φ-ing. My aims in this paper are, first, to draw on (...) recent work in epistemology to explain and defend the Unity Thesis and, second, to argue that it offers us an attractive conceptual alternative to a standard way of thinking about the nature of intentional action. The first step of my argument draws on the idea that what distinguishes intentional actions from bodily events is the presence of knowing-to – that is, an agent is φ-ing intentionally if and only if she is currently doing something because she knows to do it as a way for her to φ. Such a notion of knowing-to allows us to explain otherwise puzzling features of the Unity Thesis, including the claim that knowing and acting occur simultaneously. In the second step, I argue that the Unity Thesis can help us avoid various long-standing issues in the philosophy of action, including the problem of deviant (formal) causation. (shrink)