I regard it as a great excellence of my philosophy that all its truths have been found independently of each other, by contemplation of the real world; but their unity and agreement, about which I had been unconcerned, has always afterwards appeared of itself. Hence also it is rich, and has wide-spreading roots in the ground of perceptible reality, from which all nourishment of abstract truths springs; and hence, again, it is not wearisome—a quality which, to judge from the philosophical writings of the last fifty years, one might regard as essential to philosophy. If, on the other hand, all the doctrines of a philosophy are merely deduced the one out of the other, and ultimately indeed all out of one first principle, it must be poor and meagre, and consequently wearisome, for nothing can follow from a proposition except what it really already says itself. Moreover, in this case everything depends upon the correctness of one proposition, and by a single mistake in the deduction the truth of the whole would be endangered. Still less security is given by the systems which start from an intellectual intuition, i.e., a kind of ecstasy or clairvoyance. All knowledge so obtained must be rejected as subjective, individual, and consequently problematical. Even if it actually existed it would not be communicable, for only the normal knowledge of the brain is communicable; if it is abstract, through conceptions and words; if purely perceptible or concrete, through works of art.
If, as so often happens, metaphysics is reproached with having made so little progress, it ought also to be considered that no other science has grown up like it under [pg 394] constant oppression, none has been so hampered and hindered from without as it has always been by the religion of every land, which, everywhere in possession of a monopoly of metaphysical knowledge, regards metaphysics as a weed growing beside it, as an unlicensed worker, as a horde of gipsies, and as a rule tolerates it only under the condition that it accommodates itself to serve and follow it. For where has there ever been true freedom of thought? It has been vaunted sufficiently; but whenever it wishes to go further than perhaps to differ about the subordinate dogmas of the religion of the country, a holy shudder seizes the prophets of tolerance, and they say: “Not a step further!” What progress of metaphysics was possible under such oppression? Nay, this constraint which the privileged metaphysics exercises is not confined to the communication of thoughts, but extends to thinking itself, for its dogmas are so firmly imprinted in the tender, plastic, trustful, and thoughtless age of childhood, with studied solemnity and serious airs, that from that time forward they grow with the brain, and almost assume the nature of innate thoughts, which some philosophers have therefore really held them to be, and still more have pretended to do so. Yet nothing can so firmly resist the comprehension of even the problem of metaphysics as a previous solution of it intruded upon and early implanted in the mind. For the necessary starting-point for all genuine philosophy is the deep feeling of the Socratic: “This one thing I know, that I know nothing.” The ancients were in this respect in a better position than we are, for their national religions certainly limited somewhat the imparting of thoughts; but they did not interfere with the freedom of thought itself, because they were not formally and solemnly impressed upon children, and in general were not taken so seriously. Therefore in metaphysics the ancients are still our teachers.
Whenever metaphysics is reproached with its small progress, [pg 395] and with not having yet reached its goal in spite of such sustained efforts, one ought further to consider that in the meanwhile it has constantly performed the invaluable service of limiting the boundless claims of the privileged metaphysics, and yet at the same time combating naturalism and materialism proper, which are called forth by it as an inevitable reaction. Consider to what a pitch the arrogance of the priesthood of every religion would rise if the belief in their doctrines was as firm and blind as they really wish. Look back also at the wars, disturbances, rebellions, and revolutions in Europe from the eighth to the eighteenth century; how few will be found that have not had as their essence, or their pretext, some controversy about beliefs, thus a metaphysical problem, which became the occasion of exciting nations against each other. Yet is that whole thousand years a continual slaughter, now on the battlefield, now on the scaffold, now in the streets, in metaphysical interests! I wish I had an authentic list of all crimes which Christianity has really prevented, and all good deeds it has really performed, that I might be able to place them in the other scale of the balance.
Lastly, as regards the obligations of metaphysics, it has only one; for it is one which endures no other beside it—the obligation to be true. If one would impose other obligations upon it besides this, such as to be spiritualistic, optimistic, monotheistic, or even only to be moral, one cannot know beforehand whether this would not interfere with the fulfilment of that first obligation, without which all its other achievements must clearly be worthless. A given philosophy has accordingly no other standard of its value than that of truth. For the rest, philosophy is essentially world-wisdom: its problem is the world. It has to do with this alone, and leaves the gods in peace—expects, however, in return, to be left in peace by them.
Supplements to the Second Book.
“Ihr folget falscher Spur,
Denkt nicht, wir scherzen!