We are still the guests of Plato today, my son, and I should like to show you that this philosopher, in whose time natural science had barely developed its first downy feathers, already suspected its stubborn narrowness, although in a certain sense the Platonic logic was no less narrow than that of the so-called exact sciences still is to-day, at least in part. Still Platonic logic had at least the advantage of its outlook toward the Supreme Being, the absolute, while modern naturalism is still stuck in the narrow land of specialties. Therefore, I hope that you will find it interesting to note with me the way in which universal truth is peeping forth beneath the wings of Platonic speculation. "Listen, then, to what I am going to say," remarks Socrates in "Phaedo," paragraph 45. "In my youth, O Cebes, I had a great interest in natural science, for it seemed to me a magnificent thing to know the cause of everything, to learn how everything begins, exists, and passes. A hundred times I turned to one thing and then to another, reflecting about these matters by myself. Do animals arise when the hot and the cold begin to disintegrate, as some claim? Is it the blood, which enables us to think, or the air or the fire? Or is it none of these, but rather the brain which produces all perceptions, such as seeing, hearing, smelling, and does memory and thought then arise by these, and from thought and memory, when they become adjusted, understanding? And again, when I considered that all this passes away, and the changes in heaven and on earth, I finally felt myself poorly qualified for this whole investigation. Let this be sufficient proof to you: In the things which formerly were familiar and known to me, I became so doubtful by this investigation, that I forgot even that which I thought I knew of many other things, as for instance the question as to how man grows. I thought that everybody knew that this was caused by eating and drinking. For when through the food flesh comes to flesh and bone to bone, and in the same way that which is akin to all the rest of the things which constitute man, it seemed natural that a small mass would become larger, and thus a small man grow tall. Does not this appear reasonable to you?... Consider furthermore this. It seemed enough to me that a man appeared large when standing by the side of something small, that he looked taller by one head, and in the same way one horse by the side of another; or what is still plainer, ten seemed to me more than eight, because it is more by two, and a thing of two feet longer than that which measures only one foot, because it exceeds it by one." Thereupon Cebes asks: "Well, and what do you think of this now?"