ABSTRACT
According to one familiar doctrine, the difference between the desired and the desirable is the difference between a matter of psychological fact and something logically independent of it, namely, a matter of value. A reason for doing, then, may or may not be a justification. In many of the incidents of our lives, one's reason for doing something is that this will enable one to do something one wants to do. When a man raises his arm, because he wants something, he not only raises his arm but also reaches for what he wants. Saying what he wants, then, is explaining what he is doing—he is reaching for what he wants. Yet there are not two distinct events, one the action of raising his arm, the other the action of reaching for what he wants, in the way in which raising one's arm (in signalling) is one thing and pressing the brake-pedal is another.
