"I would beg the wise and learned fathers……" — Galileo Galilei
"I would beg the wise and learned fathers (of the church) to consider with all diligence the difference which exists between matters of mere opinion and matters of demonstration. ... [I]t is not in the power of professors of the demonstrative sciences to alter their opinions at will, so as to be now of one way of thinking and now of another. ... [D]emonstrated conclusions about things in nature of the heavens, do not admit of being altered with the same ease as opinions to what is permissible or not, under a contract, mortgage, or bill of exchange."
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Galileo Galilei
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104 Quotes by Galileo Galilei
Galileo Galilei has 104 quotes on this site.
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I do not think it is necessary to believe that the same God who has given us our senses, reason,…
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I cannot but be astonished that Sarsi should persist in trying to prove by means of witnesses something that I…
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I therefore concluded, and decided unhesitatingly, that there are three stars in the heavens moving about Jupiter, as Venus and…
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In my studies of astronomy and philosophy I hold this opinion about the universe, that the Sun remains fixed in…
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Their vain presumption of knowing all can take beginning solely from their never having known anything; for if one has…
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Mathematics is the key and door to the sciences.
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Science proceeds more by what it has learned to ignore than what it takes into account.
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Two truths cannot contradict one another.
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But, because my private lectures and domestic pupils are a great hinderance and intteruption of my studies, I wish to…
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The Grand Duke [of Tuscany] ...after observing the Medicaean plants several times with me ... has now invited me to…
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Nature . . . is inexorable and immutable; she never transgresses the laws imposed upon her, nor cares a whit…
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If you could see the earth illuminated when you were in a place as dark as night, it would look…
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