You, my son, have been so fortunate as to enjoy a seven years' course in a German college. And since your teachers, at your departure, gave you the highest certificate, I may well consider you as qualified not only to enter the school of life in the United States, but also to listen intelligently to my lectures on logic. But in order that my well trained pupil may not look down upon his self-taught teacher, I appeal to the fact that even the man with the best all-around education will be a tyro in specialties; and that, on the other hand, ignorance in many things does not exclude the possibility of knowing more about a certain specialty than science has heretofore grasped. Now I claim in this case to have acquired a knowledge of the subject with which I intend to deal here that surpasses anything I have been able to find in the professional literature. I mention this, my dear Eugene, with all due modesty, not for the purpose of throwing a halo around my personality, but in order to give a certain authority to my office as teacher and to inspire my pupil with confidence. Yes, I value confidence. Although you know me as a democrat who cares nothing for authority, you shall also learn to know me as a graduate in dialectics who, though he may empty the bath, still retains his hold on the child and does not permit it to float off with the water. Children, and one may say nations in their childhood, cannot do without authority, and a teacher, whether he instruct children or nations, cannot dispense with a certain confidence-inspiring air. The pupil must believe in the wisdom of his teacher, in order that he may approach the master with the necessary attention and willingness to learn. Later on the understanding of the subject makes all authority superfluous. Thus a thing so sublime as authority is subject to the destructive tendencies of time, to the historical process. Hitherto mankind has often been tempted by preconceived notions to idolize vain things. It has been attempted to shield not only authority in general, but, what is still worse, this or that throne or altar, against the attacks of time. The relation between the perishable and the imperishable has always been subject to much misunderstanding. Now since logic is that science which aims to set the intellect aright, we shall have to touch occasionally on the general misconception of time and eternity.