Alberto simply shook his head. After a while he pointed down at the table between them and said:
"The two greatest philosophers in the seventeenth century were Descartes and Spinoza. They too struggled with questions like the relationship between 'soul' and 'body,' and we are now going to study them more closely."
"Go ahead. But I'm supposed to be home by seven."
Descartes... he wanted to clear all the rubble off the site
Alberto stood up, took off the red cloak, and laid it over a chair. Then he settled himself once again in the corner of the sofa.
"Rene Descartes was born in 1596 and lived in a number of different European countries at various periods of his life. Even as a young man he had a strong desire to achieve insight into the nature of man and the universe. But after studying philosophy he became increasingly convinced of his own ignorance."
"Like Socrates?"
"More or less like him, yes. Like Socrates, he was convinced that certain knowledge is only attainable through reason. We can never trust what the old books tell us. We cannot even trust what our senses tell us."
"Plato thought that too. He believed that only reason can give us certain knowledge."
"Exactly. There is a direct line of descent from Socrates and Plato via St. Augustine to Descartes. They were all typical rationalists, convinced that reason was the only path to knowledge. After comprehensive studies, Descartes came to the conclusion that the body of knowledge handed down from the Middle Ages was not necessarily reliable. You can compare him to Socrates, who did not trust the general views he encountered in the central square of Athens. So what does one do, Sophie? Can you tell me that?"
"You begin to work out your own philosophy."
"Right! Descartes decided to travel around Europe, the way Socrates spent his life talking to people in Athens. He relates that from then on he meant to confine himself to seeking the wisdom that was to be found, either within himself or in the 'great book of the world.' So he joined the army and went to war, which enabled him to spend periods of time in different parts of Central Europe. Later he lived for some years in Paris, but in 1629 he went to Holland, where he remained for nearly twenty years working on his mathematical and philosophic writings.
"In 1649 he was invited to Sweden by Queen Christina. But his sojourn in what he called 'the land of bears, ice, and rocks' brought on an attack of pneumonia and he died in the winter of 1650."
"So he was only 54 when he died."
"Yes, but he was to have enormous influence on philosophy, even after his death. One can say without exaggeration that Descartes was the father of modern philosophy. Following the heady rediscovery of man and nature in the Renaissance, the need to assemble contemporary thought into one coherent philosophical system again presented itself. The first significant system-builder was Descartes, and he was followed by Spinoza and Leibniz, Locke and Berkeley, Hume and Kant."
"What do you mean by a philosophical system?"
"I mean a philosophy that is constructed from the ground up and that is concerned with finding explanations for all the central questions of philosophy. Antiquity had its great system-constructors in Plato and Aristotle. The Middle Ages had St. Thomas Aquinas, who tried to build a bridge between Aristotle's philosophy and Christian theology. Then came the Renais-sance, with a welter of old and new beliefs about nature and science, God and man. Not until the seventeenth century did philosophers make any attempt to assemble the new ideas into a clarified philosophical system, and the first to attempt it was Descartes. His work was the forerunner of what was to be philosophy's most important project in the coming generations. His main concern was with what we can know, or in other words, certain knowledge. The other great question that preoccupied him was the relationship between body and mind. Both these questions were the substance of philosophical argument for the next hundred and fifty years."
"He must have been ahead of his time."
"Ah, but the question belonged to the age. When it came to acquiring certain knowledge, many of his contemporaries voiced a total philosophic skepticism. They thought that man should accept that he knew nothing. But Descartes would not. Had he done so he would not have been a real philosopher. We can again draw a parallel with Socrates, who did not accept the skepticism of the Sophists. And it was in Descartes's lifetime that the new natural sciences were developing a method by which to provide certain and exact descriptions of natural processes.
"Descartes was obliged to ask himself if there was a similar certain and exact method of philosophic reflection."
"That I can understand."
"But that was only part of it. The new physics had also raised the question of the nature of matter, and thus what determines the physical processes of nature. More and more people argued in favor of a mechanistic view of nature. But the more mechanistic the physical world was seen to be, the more pressing became the question of the relationship between body and soul. Until the seventeenth century, the soul had commonly been considered as a sort of 'breath of life' that pervaded all living creatures. The original meaning of the words 'soul' and 'spirit' is, in fact, 'breath' and 'breathing.' This is the case for almost all European languages. To Aristotle, the soul was something that was present everywhere in the organism as its 'life principle'--and therefore could not be conceived as separate from the body. So he was able to speak of a plant soul or an animal soul. Philosophers did not introduce any radical division of soul and body until the seventeenth century. The reason was that the motions of all material objects--including the body, animal or human--were explained as involving mechanical processes. But man's soul could surely not be part of this body machinery, could it?