 But how does this proposition, that judgments of experience are supposed to contain necessity in the synthesis of perceptions, agree with my proposition, urged many times above, that experience, as a posteriori cognition, can yield only contingent judgments? If I say that experience teaches me something, I always mean only the perception that lies within in it, e.g., that heat always follows the illumination of the stone by the sun. That this heating results necessarily from the illumination by the sun is in fact contained in the judgment of experience (in virtue of the concept of cause); but I do not learn this from experience, rather, conversely, experience is first generated through this addition of the concept of the understanding (of cause) to the perception.