t's view that human experience is bounded by space and time and that it is intelligible only as a system of completely determined causal relations existing between events in the world and not between the world and anything outside of it has the consequence that there can be no knowledge of God, freedom, or human immortality. Each of these ideas exceeds the bounds of empirical experience and so is banished from ‘the realm of reason.’ As he said, he “found it necessary to deny knowledge, in order to make room for faith.” For Kant, the distinctions between analytic and synthetic and a priori and a posteriori judgments must be kept separate, because it is possible for some judgments to be synthetic and a priori at the same time. What Kant proposes is this: Surely all a posteriori judgments are synthetic judgments, since any judgment based solely on experience cannot be derived merely by understanding the meaning of the subject. But this does not mean that all synthetic judgments are a posteriori judgments, since in mathematical and geometrical judgments, the predicate is not contained in the subject (e.g., the concept 12 is not contained either in 7, 5, +, =, or even in their combination; nor does the concept "shortest distance between two points" contain the idea of a straight line). Such propositions are universal and necessary (and thus a priori ) even though they could not have been known from experience; and they would be synthetic a priori judgments. If there are such judgments, then how are they possible? Kant's answer: the rationalists are right in saying that we can know about things in the world with certainty; and the empiricists are right in saying that such knowledge cannot be limited merely to truths by definition nor can it be provided by experience. Instead, we know about the world ‘insofar as we experience it’ according to the unchanging and universally shared structure of min...
