In the former we abstract from all empirical conditions under which our understanding is exercised,.g., from the influence of the senses, from the play of imagination, the laws of memory, the power of habit, inclination, etc., hence also from the sources of prejudice, indeed in general from all causes from which certain cognitions arise or may be supposed to arise, because these merely concern the understanding under certain circum stances of its application, and experience is required in order to know these.