"That too was characterized by powerful struggles between diametrically opposed modes of thought. As I have already mentioned, some philosophers believed that what exists is at bottom spiritual in nature. This standpoint is called idealism. The opposite viewpoint is called materialism. By this is meant a philosophy which holds that all real things derive from concrete material substances. Materialism also had many advocates in the seventeenth century. Perhaps the most influential was the English philosopher Thomas Hobbes. He believed that all phenomena, including man and animals, consist exclusively of particles of matter. Even human consciousness--or the soul--derives from the movement of tiny particles in the brain."
"So he agreed with what Democritus said two thousand years before?"
"Both idealism and materialism are themes you will find all through the history of philosophy. But seldom have both views been so clearly present at the same time as in the Baroque. Materialism was constantly nourished by the new sciences. Newton showed that the same laws of motion applied to the whole universe, and that all changes in the natural world--both on earth and in space--were explained by the principles of universal gravitation and the motion of bodies.
"Everything was thus governed by the same unbreakable laws--or by the same mechanisms. It is therefore possible in principle to calculate every natural change with mathematical precision. And thus Newton completed what we call the mechanistic world view."
"Did he imagine the world as one big machine?"
"He did indeed. The word 'mechanic' comes from the Greek word 'mechane,' which means machine. It is remarkable that neither Hobbes nor Newton saw any contradiction between the mechanistic world picture and belief in God. But this was not the case for all eighteenth- and nineteenth-century materialists. The French physician and philosopher La Mettrie wrote a book in the eighteenth century called L 'homme machine, which means 'Man--the machine.' Just as the leg has muscles to walk with, so has the brain 'muscles' to think with. Later on, the French mathematician Laplace expressed an extreme mechanistic view with this idea: If an intelligence at a given time had known the position of all particles of matter, 'nothing would be unknown, and both future and past would lie open before their eyes.' The idea here was that everything that happens is predetermined. 'It's written in the stars' that something will happen. This view is called determinism." "So there was no such thing as free will."
"No, everything was a product of mechanical processes--also our thoughts and dreams. German materialists in the nineteenth century claimed that the relationship of thought to the brain was like the relationship of urine to the kidneys and gall to the liver." "But urine and gall are material. Thoughts aren't." "You've got hold of something central there. I can tell you a story about the same thing. A Russian astronaut and a Russian brain surgeon were once discussing religion. The brain surgeon was a Christian but the astronaut was not. The astronaut said, 'I've been out in space many times but I've never seen God or angels.' And the brain surgeon said, 'And I've operated on many clever brains but I've never seen a single thought.' " "But that doesn't prove that thoughts don't exist."
"No, but it does underline the fact that thoughts are not things that can be operated on or broken down into ever smaller parts. It is not easy, for example, to surgically remove a delusion. It grows too deep, as it were, for surgery. An important seventeenth-century philosopher named Leibniz pointed out that the difference between the material and the spiritual is precisely that the material can be broken up into smaller and smaller bits, but the soul cannot even be divided into two."
"No, what kind of scalpel would you use for that?"