" Thinking is what angels do—it is a property given to Man by God.” “How do you suppose God gives it to us?” “I do not pretend to know, sir!” “If you take a man’s brain and distill him, can you extract a mysterious essence—the divine presence of God on Earth?” “That is called the Philosophick Mercury by Alchemists.” “Or, if Hooke were to peer into a man’s brain with a good enough microscope, would he see tiny meshings of gears?” Daniel said nothing. Leibniz had imploded his skull. The gears were jammed, the Philosophick Mercury dribbling out his ear-holes. "

― Neal Stephenson , The Baroque Cycle: Quicksilver, The Confusion, and The System of the World