The self is known to exist only as thinking something given to it in time; and we cannot have knowledge of our own existence apart from our knowledge of our existence as a succession of definite thoughts. We have now seen that self-knowledge is more than consciousness of the universal nature of thought. Instead of going straight on to assert that inner sense, as concerned only with temporal relations, cannot give us reality as it is in itself, Kant proceeds to a description of time. Here Kant can only register his opinion that both these doctrines are essential to the Critical Philosophy, he glad to have at least the partial support of the Master of Balliol on this point. Kant's conclusion is that for the possibility of experience in general the reality of outer sense is necessarily bound up with the reality of inner sense. The doctrine we have just examined may be described as Kant's empirical realism.