10. This guiding identity runs through all the surprises and contrasts of the piece, and characterizes every law. Man carries the world in his head, the whole astronomy and chemistry suspended in a thought. Because the history of nature is charactered in his brain, therefore is he the prophet and discoverer of her secrets. Every known fact in natural science was divined by the presentiment of somebody, before it was actually verified. A man does not tie his shoe without recognizing laws which bind the farthest regions of nature: moon, plant, gas, crystal, are concrete geometry and numbers. Common sense knows its own, and recognizes the fact at first sight in chemical experiment. The common sense of Franklin, Dalton, Davy and Black, is the same common sense which made the arrangements which now it discovers.