Go ahead and let this passage from a wonderful piece on Galileo by Adam Gropnik in The New Yorker blow your mind.
What would Shakespeare’s Galileo have been, one wonders, had he ever written him? Well, in a sense, he had written him, as Falstaff, the man of appetite and wit who sees through the game of honor and fidelity. Galileo’s myth is not unlike the fat knight’s, the story of a medieval ethic of courage and honor supplanted by the modern one of cunning, wit, and self-knowledge. Martyrdom is the test of faith, but the test of truth is truth. Once the book was published, who cared what transparent lies you had to tell to save your life? The best reason we have to believe in miracles is the miracle that people are prepared to die for them. But the best reason that we have to believe in the moons of Jupiter is that no one has to be prepared to die for them in order for them to be real.
What is honour? a word. What is in that word honour? what is that honour? air.