Monism pays attention only to the unity and tries either to deny or to slur over the opposites, present though they are. Neither of these two points of view can satisfy us, for they do not do justice to the facts. The most ingenious and the most absurd hypotheses have been propounded to answer these questions. Up to the present, however, monism is not in a much better position. It has tried three different ways of meeting the difficulty.
Materialism can never offer a satisfactory explanation of the world.
For every attempt at an explanation must begin with the formation of thoughts about the phenomena of the world. Materialism thus begins with the thought of matter or material processes. The materialist seeks to make these latter intelligible by regarding them as purely material processes. He believes that thinking takes place in the brain, much in the same way that digestion takes place in the animal organs. Just as he attributes mechanical and organic effects to matter, so he credits matter in certain circumstances with the capacity to think.