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 A man building up an intellectual system has to build like Nehemiah, with the sword in one hand and the trowel in the other. The imagination, the constructive quality, is the trowel, and argument is the sword. A wide experience of actual intellectual affairs will lead most people to the conclusion that logic is mainly valuable as a weapon wherewith to exterminate logicians.

But though this may be true enough in practice, it scarcely clears up the position of logic in human affairs. Logic is a machine of the mind, and if it is used honestly it ought to bring out an honest conclusion. When people say that you can prove anything by logic, they are not using words in a fair sense. What they mean is that you can prove anything by bad logic. Deep in the mystic ingratitude of the soul of man there is an extraordinary tendency to use the name for an organ, when what is meant is the abuse or decay of that organ. Thus we speak of a man suffering from "nerves," which is about as sensible as talking about a man suffering from ten