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"When we try to apply practical rules of pure reason to judgment of action in the real empirical cases, we find something required which mediates between the law of freedom and the empirical reality. It corresponds to the fact that theoretical reason requires a schema for applying pure concepts of understandingto the knowledge of empirical objects. Though theoretical reason can use pure intuition of time and space, it is not the case with pracitical reason. Because practical reason concerns only the determination of will, it does not require any intuition. Kant asserts that practical reason can use universal laws of nature as a type of moral law, and therefore it can apply moral laws to real cases of action. Here he is carrying the analogy between natural laws and moral laws as he did when he defined the first form of the categorical imperative in Foundation of the Metaphysics of Morals. According to him we can judge whether a maxim is morally acceptable or not by regarding maxims of act as universal laws of nature. Kant calls this process ""typic of pure practical reason"", making it the medium for the application of the laws of pure reason to the empirical reality. This means that moral law always presupposes its application to the empirical reality, and therefore is conceived in the tension with the reality."