Galileo Galilei Quotes - Page 6

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• Alas! Your dear friend and servant Galileo has been for the last month hopelessly blind; so that this heaven, this earth, this universe, which I by my marvelous discoveries and clear demonstrations had enlarged a hundred thousand times beyond the belief of the wise men of bygone ages, henceforward for me is shrunk into such a small space as is filled by my own bodily sensations.

  Galileo Galilei

  Wise, Men, Discovery

  Letter to Élie Diodati (p. 279), January 2, 1638.

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• Their vain presumption of knowing all can take beginning solely from their never having known anything; for if one has but once experienced the perfect knowledge of one thing, and truly tasted what it is to know, he shall perceive that of infinite other conclusions he understands not so much as one.

  Galileo Galilei

  Knowledge, Science, Knowing

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• Spots are on the surface of the solar body where they are produced and also dissolved, some in shorter and others in longer periods. They are carried around the Sun; an important occurrence in itself.

  Galileo Galilei

  Science, Important, Body

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• For my part I consider the earth very noble and admirable precisely because of the diverse alterations, changes, generations, etc. that occur in it incessantly.

  Galileo Galilei

  Generations, Noble, Earth

  Galileo Galilei (1967). “Dialogue Concerning the Two Chief World Systems, Ptolemaic and Copernican, Second Revised Edition”, p.58, Univ of California Press

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• They seemed to forget that the increase of known truths stimulates the investigation, establishment and growth of the arts; not their dimination or destruction.

  Galileo Galilei

  Art, Growth, Forget

  Galileo Galilei (2017). “Delphi Collected Works of Galileo Galilei (Illustrated)”, p.73, Delphi Classics

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• Nothing physical which sense-experience sets before our eyes, or which necessary demonstrations prove to us, ought to be called in question (much less condemned) upon the testimony of biblical passages...

  Galileo Galilei

  Eye, Biblical, Thinking

  Essay published in 1615, in response to enquiries of Christina of Tuscany, as quoted in "Aspects of Western Civilization : Problems and Sources in History" by Perry McAdow Rogers, (p. 53), sourcebooks.fordham.edu. 1988.

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• When the moon is ninety degrees away from the sun it sees but half the earth illuminated (the western half). For the other (the eastern half) is enveloped in night. Hence the moon itself is illuminated less brightly from the earth, and as a result its secondary light appears fainter to us.

  Galileo Galilei

  Science, Moon, Night

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• Surely it is a great thing to increase the numerous host of fixed stars previously visible to the unaided vision, adding countless more which have never before been seen, exposing these plainly to the eye in numbers ten times exceeding the old and familiar stars.

  Galileo Galilei

  Stars, Eye, Numbers

  "Discoveries and Opinions of Galileo". Book by Galileo Galilei, 1957.

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