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You sometimes hear the name Giordano Bruno (1548–1600) invoked as a prequel to the life of Galileo Galilei (1564–1642). These two natural philosophers, countrymen of the Italian peninsula, stood ready to shove the Earth from its ancient resting place and set it in orbit around the Sun. Though a rotating, revolving Earth challenged common sense and flew in the face of received wisdom, still they both embraced the idea—at their peril. The difference is that Bruno died for his beliefs (tied to a stake and set on fire in a public square in Rome), while Galileo recanted before the Inquisition and lived to advanced old age under house arrest.
(The Publishers Weekly)

"I fought, and that's a lot. I thought I could win ... but nature and luck curbed my endeavour. But it's already something that I took up the struggle, because I see that victory is in the hands of Fate. In me was what was possible and what no future century will be able to deny to me: what a winner could give from his own; that I did not fear death, that I did not submit, my face firm, to anyone of my breed; that I preferred courageous death to pavid life."
- Giordano Bruno

"Giordano was born five years after Copernicus died. He had bequeathed an intoxicating idea to the generation that was to follow him. We hear a lot in our own day about the expanding universe. The thought of the Infinity of the Universe was one of the great stimulating ideas of the Renaissance... He suffered a cruel death and achieved a unique martyr's fame. He has become the Church's most difficult alibi. She can explain away the case of Galileo with suave condescension. Bruno sticks in her throat."
-Dr. John Kessler