" Judge them by their works. What have they done for mankind beyond the spinning of airy fancies and the mistaking of their own shadows for gods? They have added to the gayety of mankind, I grant; but what tangible good have they wrought for mankind? They philosophized, if you will pardon my misuse of the word, about the heart as the seat of the emotions, while the scientists were formulating the circulation of the blood. They declaimed about famine and pestilence as being scourges of God, while the scientists were building granaries and draining cities. They builded gods in their own shapes and out of their own desires, while the scientists were building roads and bridges. They were describing the earth as the centre of the universe, while the scientists were discovering America and probing space for the stars and the laws of the stars. In short, the metaphysicians have done nothing, absolutely nothing, for mankind. Step by step, before the advance of science, they have been driven back. "

― Jack London , The Iron Heel