 Green considers the apparent threat to responsibility resulting from the claim that agents necessarily act on their strongest desires (PE §§103–106, 139–42). He thinks that the threat is specious, because it rests on an ambiguity. Some desires are stronger because more intense, but desires can also be stronger when they are endorsed after deliberation. The action of non-rational animals is just the vector sum of the intensity of their desires; they do act on their strongest desires, in this first sense. But responsible agents—who have moral personality and can distinguish between the strength and authority of desire and act on these judgments—need not act on their strongest desire in this first sense. Instead, they can be moved by the strongest desire after deliberation. It’s only by failing to distinguish these two different kinds of strength, Green thinks, that one could see a threat to responsibility here.