Experimental science only then gives positive knowledge and displays the greatness of the human mind when it does not introduce into its investigations the question of an ultimate cause. And, on the contrary, abstract science is only then science and displays the greatness of the human mind when it puts quite aside questions relating to the consequential causes of phenomena and regards man solely in relation to an ultimate cause. Such in this realm of science⁠—forming the pole of the sphere⁠—is metaphysics or philosophy. That science states the question clearly: “What am I, and what is the universe? And why do I exist, and why does the universe exist?” And since it has existed it has always replied in the same way. Whether the philosopher calls the essence of life existing within me, and in 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.