This paper argues that perception of one's body ‘from the inside’ provides one with an awareness of acting, and that this awareness explains a previously overlooked feature of one's knowledge of one's own actions. Actions are events: they occur during periods of time. Knowledge of such events must be sensitive to their course through time. Perception of one's body ‘from the inside’ allows one to monitor one's actions as they unfold, thereby sustaining one's knowledge of what one is doing over (...) the period of time in which one is doing it. (shrink)