Hence, when one sets forth on the enterprise of using all one's time, it is just as well to remember that one's own time, and not other people's time, is the material with which one has to deal; that the earth rolled on pretty comfortably before one began to balance a budget of the hours, and that it will continue to roll on pretty comfortably whether or not one succeeds in one's new role of chancellor of the exchequer of time.
