We also know that the greatest power is lodged in the fine, not in the coarse. We see a man take up a huge weight, we see his muscles swell, and all over his body we see signs of exertion, and we think the muscles are powerful things. But it is the thin thread-like things, the nerves, which bring power to the muscles; the moment one of these threads is cut off from reaching the muscles, they are not able to work at all. These tiny nerves bring the power from something still finer, and that again in its turn brings it from something finer still — thought,
