...philosophy does not, like exact or empirical science, bring us to know things of which we were simply ignorant, but brings us to know in a different way things which we already knew in some way; and indeed it follows from our own hypothesis; for if the species of a philosophical genus overlap, the distinction between the known and the unknown, which in a non-philosophical subject-matter involves a difference be-tween two mutually exclusive classes of truths, in a philosophical subject-matter im- plies that we may both know and not know the same thing; a paradox which disappears in the light of the notion of a scale of forms of knowledge, where coming to know means coming to know in a different and better way.