all that exists, by the name of “idea,” or “substance,” or “spirit,” or “will,” he says one and the same thing: that this essence exists and that I am of that same essence; but why it is he does not know, and does not say, if he is an exact thinker. I ask: “Why should this essence exist? What results from the fact that it is and will be?” … And philosophy not merely does not reply, but is itself only asking that question. And if it is real philosophy all its labour lies merely in trying to put that question clearly. And if it keeps firmly to its task it cannot reply to the question otherwise than thus: “What am I, and what is the universe?” “All and nothing”; and to the question “Why?” by “I do not know.”
So that however I may turn these replies of philosophy, I can never obtain anything like an answer—and not because, as in the clear experimental sphere, the reply does not relate to my question, but because here, though all the mental work is directed just to my question, there is no answer, but instead of an answer one gets the same question, only in a complex form.