You are not only related to your father, mother, brothers, sisters, relatives and friends, but also to your community, state, and finally to the entire population of the globe. Your welfare is dependent on their welfare, on the welfare of the whole.
I know very well that the horizon of the everyday capitalist minds does not reach farther than they can see from the steeple of their church. They think according to the bad maxim: The shirt is closer to the skin than the coat. If I had to choose between the shirt and the coat, I should prefer to wear the coat without a shirt rather than to run around in shirt sleeves as the object of universal ridicule. The old man who plants a tree the fruits of which he will perhaps never see is not such a capitalist mind, otherwise he would sow seeds that would ripen during this year's summer.
At this juncture we must remember that the disciples of Socrates who looked for the absolute under the name of the "good," were in so far narrow as they conceived of it only from the moral, specifically human, standpoint, instead of at the same time considering its cosmic side. Just as health and wealth belong together, and even these are not sufficient for human welfare which further requires all social and political virtues, so the good is not comprised in the interrelations of all mankind, but passes beyond them and connects itself with the entire universe. Without the universe man is nothing. He has no eyes without light, no ears without sound, no morals without physics. Man is not so much the measure of all things; his more or less intimate connection with all things is rather the measure of all humanity. Not narrow morality, but the universe, the supreme being, is the good in the very highest meaning of the word, is absolute good, right, truth, beauty, and reason.
In my preceding letter I spoke of universal reason and said that not alone men, but also mountains, valleys, forests and fields, and even fools and knaves were reasonable. Now you are familiar with that student's song: "What's Coming from the Heights?" and you know that it makes everything leathern. It speaks of a leathern hill, a leathern coach-driver, a leathern letter, even father, mother, and sister are of leather. And I mention this simply for the purpose of showing that I understand that we cannot call leather reasonable and reasonable leathern without brewing a mixture of language which is lacking the mark by which all reasonable language is distinguished from chattering, howling, and roaring. Language is only reasonable when it classifies the world and distinguishes things by different names.
This is easily understood. But it is more difficult to see that those who use their intellect without logical training exaggerate distinctions to such an extent that they ignore the connection between them. All things are not only distinct, but also connected. But logic so far must be blamed for not rising to the recognition of the interrelation of all things. The science of understanding frequently treats reason and experience as if they were two different things without a common nature. Therefore, I make it a point to insist that there is no experience without reason and no reason without experience.
The linguists who dispute about the question whether reason has developed after language or language after reason agree that both belong together. One cannot speak without the use of reason, or talk without sense, because chattering, or babbling, or whatever one may wish to call it, are everything else but language. On the other hand, there can be no reason without naming the things of this world, so as to distinguish between leather and lady, between reason and experience.
Of course, the idea of a leathern lady is only a youthful prank. Still it is calculated to illustrate the dialectic transfusion of all names and things, of all subjects and predicates. It shows indirectly that according to common sense thought, reason has its home only in the brain of man, and that this reason is nevertheless unsound when it does not know and remember that the individual human brain is connected with all brains, and reasons with the whole world, so that only all existence and the entire universe is reasonable in the highest meaning of the word.
In order to be able to use your reason in all research and on all objects in a reasonable manner, you must know that the whole world has one nature, even leather and your sister. Apparently there is a wide gulf between these two, and yet in both of them the same forces are active, just as a black horse has the same horse nature as a white horse, so that from this point of view your sister is indeed leathern and leather sisterly. Such statements sound paradoxical enough, yet I insist on making them in this extreme manner in order to fully reveal the absolute oneness of all existence, since it is the indispensable basis of a reasonable understanding of logic.
Take one of the questions of the day now agitating the public mind, for a further illustration. Two tendencies are now observed in the most radical political movement of the nations. One of them is called propaganda of the deed. It works in Russia and Ireland with dynamite, powder, and lead. The other recommends the propaganda of the word, of the vote, and of lawful agitation. And the difference between these two is not discussed reasonably with a view to ascertaining for whom, when, where, and why, this or that propaganda is fitting, but every one tries to present his relative truth with the fanatical sectarianism of those who claim absolute truth. But if you have grasped the method of getting at truth, the true method of using your reasoning faculty, you will take sides for one thing today and for another thing tomorrow, because you will understand that all roads are leading toward Rome. And if some of the comrades outvote you occasionally, you will still value these antagonists as friends, and if you combat them, even in a war to the knife, this will still be a relative war, a use of the knife with reason.
Our proletarian logic is tolerant, not fanatical. This logic does not want to be reasonable without passion, nor passionate without reason. It does not abolish the difference between friend and foe, between truth and falsehood, between reason and nonsense, but calms the fanaticism which exaggerates those distinctions. Its fundamental maxim is: There is only one absolute, the universe.