The active/passive distinction, once a hallmark of classical metaphysics, has largely been discarded from contemporary thought. The revival of powers theory has not seen an equally vigorous rehabilitation of the real distinction between active and passive powers. I begin an analysis and vindication with a critique of E.J. Lowe's discussion. I then argue that the active/passive problem is a metaphysical one, not a logical or logico‐linguistic one, and so logic is impotent to solve it. Following this is a discussion of (...) the rights and wrongs of Aristotle's and Aquinas's (identical) defence of the distinction. We will see that one main part of their analysis is a bright red herring while the other part contains the solution to the problem. I then state and clarify the key Scholastic principle concerning action and passion, which I call the Fundamental Thesis – one that will appear scandalous to contemporary ears, yet from which we can derive the tools needed to understand action and passion in the right way. I end with a definition of what I call the Minimal Metaphysical Agent, where the formulation is to be understood as an epistemic criterion for identifying agent and patient in a given causal interaction. (shrink)