"Is there such a thing as being? What is it? etc. Yet immediately an abyss opens under my feet: I who ask these questions about being, how can I be sure that I exist? Yet surely I, who formulate this problem should be able to remain outside it - before or beyond it? Clearly this is not so. The more I consider it the more I find that this problem tends inevitably to invade the proscenium from which it is excluded in theory: it is only by means of a fiction that Idealism in its traditional form seeks to maintain on the margin of being the consciousness which asserts or denies it."