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The Harmlessness of Metaphysic in the Future.—As soon as religion, art and ethics are so understood that a full comprehension of them can be gained without taking refuge in the postulates of metaphysical claptrap at any point in the line of reasoning, there will be a complete cessation of interest in the purely theoretical problem of the "thing in itself" and the "phenomenon." For here, too, the same truth applies: in religion, art and ethics we are not concerned with the "essence of the cosmos".7 We are in the sphere of pure conception. No presentiment [or intuition] can carry us any further. With perfect tranquility the question of how our conception of the world could differ so sharply from the actual world as it is manifest to us, will be relegated to the physiological sciences and to the history of the evolution of ideas and organisms.

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Language as a Presumptive Science.—The importance of language in the development of civilization consists in the fact that by means of it man placed one world, his own, alongside another, a place of leverage that he thought so firm as to admit of his turning the rest of the cosmos on a pivot that he might master it. In so far as man for ages looked upon mere ideas and names of things as upon aeternae veritates, he evinced the very pride with which he raised himself above the brute. He really supposed that in language he possessed a knowledge of the cosmos. The language builder was not so modest as to believe that he was only giving names to things. On the contrary he thought he embodied the highest wisdom concerning things in [mere] words; and, in truth, language is the first movement in all strivings for wisdom. Here, too, it is faith in ascertained truth8 from which the mightiest fountains of strength have flowed. Very tardily—only now—it dawns upon men that they have propagated a monstrous error in their belief in language. Fortunately, it is too late now to arrest and turn back the evolutionary process of the reason, which had its inception in this belief. Logic itself rests upon assumptions to which nothing in the world of reality corresponds. For example, the correspondence of certain things to one another and the identity of those things at different periods of time are assumptions pure and simple, but the science of logic originated in the positive belief that they were not assumptions at all but established facts. It is the same with the science of mathematics which certainly would never have come into existence if mankind had known from the beginning that in all nature there is no perfectly straight line, no true circle, no standard of measurement.

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Dream and Civilization.—The function of the brain which is most encroached upon in slumber is the memory; not that it is wholly suspended, but it is reduced to a state of imperfection as, in primitive ages of mankind, was probably the case with everyone, whether waking or sleeping. Uncontrolled and entangled as it is, it perpetually confuses things as a result of the most trifling similarities, yet in the same mental confusion and lack of control the nations invented their mythologies, while nowadays travelers habitually observe how prone the savage is to forgetfulness, how his mind, after the least exertion of memory, begins to wander and lose itself until finally he utters falsehood and nonsense from sheer exhaustion. Yet, in dreams, we all resemble this savage. Inadequacy of distinction and error of comparison are the basis of the preposterous things we do and say in dreams, so that when we clearly recall a dream we are startled that so much idiocy lurks within us. The absolute distinctness of all dream-images, due to implicit faith in their substantial reality, recalls the conditions in which earlier mankind were placed, for whom hallucinations had extraordinary vividness, entire communities and even entire nations laboring simultaneously under them. Therefore: in sleep and in dream we make the pilgrimage of early mankind over again.

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Logic of the Dream.—During sleep the nervous system, through various inner provocatives, is in constant agitation. Almost all the organs act independently and vigorously. The blood circulates rapidly. The posture of the sleeper compresses some portions of the body. The coverlets influence the sensations in different ways. The stomach carries on the digestive process and acts upon other organs thereby. The intestines are in motion. The position of the head induces unaccustomed action. The feet, shoeless, no longer pressing the ground, are the occasion of other sensations of novelty, as is, indeed, the changed garb of the entire body. All these things, following the bustle and change of the day, result, through their novelty, in a movement throughout the entire system that extends even to the brain functions. Thus there are a hundred circumstances to induce perplexity in the mind, a questioning as to the cause of this excitation. Now, the dream is a seeking and presenting of reasons for these excitations of feeling, of the supposed reasons, that is to say. Thus, for example, whoever has his feet bound with two threads will probably dream that a pair of serpents are coiled about his feet. This is at first a hypothesis, then a belief with an accompanying imaginative picture and the argument: "these snakes must be the causa of those sensations which I, the sleeper, now have." So reasons the mind of the sleeper. The conditions precedent, as thus conjectured, become, owing to the excitation of the fancy, present realities. Everyone knows from experience how a dreamer will transform one piercing sound, for example, that of a bell, into another of quite a different nature, say, the report of cannon. In his dream he becomes aware first of the effects, which he explains by a subsequent hypothesis and becomes persuaded of the purely conjectural nature of the sound. But how comes it that the mind of the dreamer goes so far astray when the same mind, awake, is habitually cautious, careful, and so conservative in its dealings with hypotheses? why does the first plausible hypothesis of the cause of a sensation gain credit in the dreaming state? (For in a dream we look upon that dream as reality, that is, we accept our hypotheses as fully established). I have no doubt that as men argue in their dreams to-day, mankind argued, even in their waking moments, for thousands of years: the first causa, that occurred to the mind with reference to anything that stood in need of explanation, was accepted as the true explanation and served as such. (Savages show the same tendency in operation, as the reports of travelers agree). In the dream this atavistic relic of humanity manifests its existence within us, for it is the foundation upon which the higher rational faculty developed itself and still develops itself in every individual. Dreams carry us back to the earlier stages of human culture and afford us a means of understanding it more clearly. Dream thought comes so easily to us now because we are so thoroughly trained to it through the interminable stages of evolution during which this fanciful and facile form of theorising has prevailed. To a certain extent the dream is a restorative for the brain, which, during the day, is called upon to meet the many demands for trained thought made upon it by the conditions of a higher civilization.—We may, if we please, become sensible, even in our waking moments, of a condition that is as a door and vestibule to dreaming. If we close our eyes the brain immediately conjures up a medley of impressions of light and color, apparently a sort of imitation and echo of the impressions forced in upon the brain during its waking moments. And now the mind, in co-operation with the imagination, transforms this formless play of light and color into definite figures, moving groups, landscapes. What really takes place is a sort of reasoning from effect back to cause. As the brain inquires: whence these impressions of light and color? it posits as the inducing causes of such lights and colors, those shapes and figures. They serve the brain as the occasions of those lights and colors because the brain, when the eyes are open and the senses awake, is accustomed to perceiving the cause of every impression of light and color made upon it. Here again the imagination is continually interposing its images inasmuch as it participates in the production of the impressions made through the senses day by day: and the dream-fancy does exactly the same thing—that is, the presumed cause is determined from the effect and after the effect: all this, too, with extraordinary rapidity, so that in this matter, as in a matter of jugglery or sleight-of-hand, a confusion of the mind is produced and an after effect is made to appear a simultaneous action, an inverted succession of events, even.—From these considerations we can see how late strict, logical thought, the true notion of cause and effect must have been in developing, since our intellectual and rational faculties to this very day revert to these primitive processes of deduction, while practically half our lifetime is spent in the super-inducing conditions.—Even the poet, the artist, ascribes to his sentimental and emotional states causes which are not the true ones. To that extent he is a reminder of early mankind and can aid us in its comprehension.