Book2/Ch19/124-126

....the body  is the only representation of which he is conscious not just as a presentation but at the same time in an entirely differernt way, as a will....The knowing individual ...could assume that the distinctive feature of this one representation is just that it is the only one he knows in this double way, that only this one object in intuition is simultaneously accessible via two avenues of insight, and that this is not due to any difference between this one object and all otheres, but rather it is due to a difference between the relationship hes congiton as to this one object the the relation it has to all other objects. 
...when it comes to objects other  than our own body..we...assuming that they are on the one hand representations...on the other hand, what remains after disregarding their existance as  representations of a  subject must have the same inner essence as what we call will.