““Some scholars maintain that we cannot think of non-existence of space, even if we can leave out all objects in it; nor can we doubt the existence of time, for the existence of mind itself presupposes time. Their very argument, however, proves the subjectivity of time and space, because, if they were objective, we should be able to think them non-existent, as we do with other external objects. Even space and time, therefore are no more than subjective. 10.””