 The reason he gives for abandoning the Cook Wilson picture is that an action is an activity, and there is no such activity as that of originating or causing a change in oneself or anything else (273). Even if causing a change may require an activity, it is not that activity. Now often we do not know what activity is involved when one body causes a change in another. But when it comes to human actions, we do know. First, we know that we are looking for something mental, and second, we know that the word for that special kind of mental activity is ‘willing’.