Remember well that the conception of a universe which has anything outside or beside itself is still more senseless, if possible, than the idea of wooden iron. You thus see that all differences have one common nature which does not permit a transcendentally wide difference between things or opinions. Because the universe is the supreme being, therefore all differences, even those of opinion, are unessential. For the purpose of studying logic, I entreat you to pay special attention to the question of essential differences and to test it by your own experience which will come to you from day to day. By means of our logic we learn the language of the gods. In the dictionary of this language, there is only one essential being, the universal or supreme being. On the other hand, the language of the mortals calls every particle a "being," but such being can be relative beings only. Every ear of a cornfield, every hair of an ox skin, and even every one of their particles, is such a being. But these relative beings are at the same time unessential attributes. Thus all differences between the particles of the world are simultaneously essential and unessential; in other words, they have a relative existence, they merely partake of the supreme being, compared to whom they are absolutely unessential. Whether you are a good or a bad man, whether your country is happy or unhappy, free or oppressed, is very essential to you or me, but compared with the great absolute whole it is very unessential. In the universal history the fate of any single nation has no more significance than one hair on my head, although none of my hairs is there by mere chance and all of them have been counted. Hence everything is in its particular and isolated self an unessential thing, but in the general interrelation everything is a necessary, reasonable, essential and divine particle. And now we come to the moral of it all. The human reason, the special object of logical research, partakes of the nature of the universe. It is nothing in itself. As an isolated being, it is wholly void and incapable of producing any understanding or knowledge. Only in connection, not merely with the material brain, but with the entire universe, is the intellect capable of existing and acting. It is not the mere brain which thinks, but the whole man is required for that purpose; and not man alone, but the total interrelation with the universe is necessary for the purpose of thinking. Reason itself reveals no truths. The truths which are revealed to us by means of reason, are revelations of the general nature of the absolute universe. If you think of reason in this way, then, my son, you are thinking reasonably, are world-wise, logical, and true. TWENTY-THIRD LETTER (A)