“I call you metaphysicians because you reason metaphysically,” Ernest went on. “Your method of reasoning is the opposite to that of science. There is no validity to your conclusions. You can prove everything and nothing, and no two of you can agree upon anything. Each of you goes into his own consciousness to explain himself and the universe. As well may you lift yourselves by your own bootstraps as to explain consciousness by consciousness.”
“I do not understand,” Bishop Morehouse said. “It seems to me that all things of the mind are metaphysical. That most exact and convincing of all sciences, mathematics, is sheerly metaphysical. Each and every thought-process of the scientific reasoner is metaphysical. Surely you will agree with me?”
“As you say, you do not understand,” Ernest replied. “The metaphysician reasons deductively out of his own subjectivity. The scientist reasons inductively from the facts of experience. The metaphysician reasons from theory to facts, the scientist reasons from facts to theory. The metaphysician explains the universe by himself, the scientist explains himself by the universe.”
“Thank God we are not scientists,” Dr. Hammerfield murmured complacently.
“What are you then?” Ernest demanded.
“Philosophers.”
“There you go,” Ernest laughed. “You have left the real and solid earth and are up in the air with a word for a flying machine. Pray come down to earth and tell me precisely what you do mean by philosophy.”
“Philosophy is—” (Dr. Hammerfield paused and cleared his throat)—“something that cannot be defined comprehensively except to such minds and temperaments as are philosophical. The narrow scientist with his nose in a test-tube cannot understand philosophy.”
Ernest ignored the thrust. It was always his way to turn the point back upon an opponent, and he did it now, with a beaming brotherliness of face and utterance.
“Then you will undoubtedly understand the definition I shall now make of philosophy. But before I make it, I shall challenge you to point out error in it or to remain a silent metaphysician. Philosophy is merely the widest science of all. Its reasoning method is the same as that of any particular science and of all particular sciences. And by that same method of reasoning, the inductive method, philosophy fuses all particular sciences into one great science. As Spencer says, the data of any particular science are partially unified knowledge. Philosophy unifies the knowledge that is contributed by all the sciences. Philosophy is the science of science, the master science, if you please. How do you like my definition?”