Jaspers' consideration of metaphysics rests on two premises-one phrased by Socrates: 'I know that I do not know'; the other by Shakespeare: 'There are more things in heaven and earth than are dreamt of in your philosophy.' If volume 1 of Philosophy dealt with what man can know, and volume 2 with what he can be, volume 3 deals with that which he cannot know and cannot be.
