As we all know, it was Kant who first raised the question: ‘Is metaphysics possible?’2 He answered this question in the negative; and his argument applies with equal force to the realities in which religion is especially interested. The manifold of sense, according to him, must fulfil certain formal conditions in order to constitute knowledge. The thing-in-itself is only a limiting idea. Its function is merely regulative. If there is some actuality corresponding to the idea, it falls outside the boundaries of experience, and consequently its existence cannot be rationally demonstrated. This verdict of Kant cannot be easily accepted.