Galileo Galilei

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Galileo Galilei (15 February 1564 - 8 January 1642) Italian physicist and astronomer

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Letter to Christina of Tuscany

  • But I do not feel obliged to belive that that same God who has endowed us with senses, reason, and intellect has intended to forgo their use and by some other means to give us knowledge which we can attain by them.
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Attributed

  • All truths are easy to understand once they are discovered; the point is to discover them.
  • Mathematics is the key and door to the sciences.
  • Eppur si muove
    • "And yet it [the earth] moves" or "but it moves" is a comment he is rumored to have made after his recantation before the Inquisition.
  • I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forego their use.
  • I never met a man so unknowledgeable, I could not learn something from him.
  • If you could see the earth illuminated when you were in a place as dark as night, it would look to you more splendid than the moon.
  • In questions of science the authority of a thousand is not worth the humble reasoning of a single individual.
  • My dear Kepler, what would you say of the learned here, who, replete with the pertinacity of the asp, have steadfastly refused to cast a glance through the telescope? What shall we make of this? Shall we laugh, or shall we cry?
  • Philosophy is written in this grand book— I mean the universe— which stands continually open to our gaze, but it cannot be understood unless one first learns to comprehend the language in which it is written. It is written in the language of mathematics, and its characters are triangles, circles, and other geometric figures, without which it is humanly impossible to understand a single word of it; without these, one is wandering about in a dark labyrinth (1623)
  • The great book of nature is written in mathematical symbols.
  • The Bible tells us how to go to the heavens, not how the heavens go.
  • What has philosophy got to do with measuring anything?
  • Wine is "light held together by moisture."
  • You cannot teach a man anything, you can only help him to find it for himself.
  • Surely, God could have caused birds to fly with their bones made of solid gold, with their veins full of quicksilver, with their flesh heavier than lead, and with their wings exceedingly small. He did not, and that ought to show something. It is only in order to shield your ignorance that you put the Lord at every turn to the refuge of a miracle.
    Dialogue Concerning the Two Chief World Systems
  • Mathematics is the language in which God wrote the universe.
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