I Think, Therefore I Am

I had long before remarked that, in relation to practice, it is sometimes necessary to adopt, as if above doubt, opinions which we discern to be highly uncertain, as has been already said; but as I then desired to give my attention solely to the search after truth, I thought that a procedure exactly the opposite was called for, and that I ought to reject as absolutely false all opinions in regard to which I could suppose the least ground for doubt, in order to ascertain whether after that the...

 Idealism and Metaphysics are Easy

Idealism and metaphysics are the easiest things in the world, because people can talk as much nonsense as they like without basing it on objective reality or having it tested against reality. Materialism and dialectics, on the other hand, need effort. They must be based on and tested by objective reality. Unless one makes the effort one is liable to slip into idealism and metaphysics. Introductory note to "Material on the Hu Feng Counter-Revolutionary Clique" (May 1955).

 Physics VS Metaphysics

In the 1920s, there was a dinner at which the physicist Robert W. Wood was asked to respond to a toast ... "To physics and metaphysics." Now by metaphysics was meant something like philosophy—truths that you could get to just by thinking about them. Wood took a second, glanced about him, and answered along these lines: The physicist has an idea, he said. The more he thinks it through, the more sense it makes to him. He goes to the scientific literature, and the more he reads, the more promi...

 Do Atoms Exist?

The question whether atoms exist or not... belongs rather to metaphysics. In chemistry we have only to decide whether the assumption of atoms is an hypothesis adapted to the explanation of chemical phenomena... whether a further development of the atomic hypothesis promises to advance our knowledge of the mechanism of chemical phenomena... I rather expect that we shall some day find, for what we now call atoms, a mathematico-mechanical explanation, which will render an account of atomic weigh...