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To be humane, we must ever be ready to pronounce that wise, ingenious and modest statement 'I do not know'.

Galileo Galilei

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Galileo Galilei
Age: 77 †
Born: 1564
Born: February 15
Died: 1642
Died: January 8
Astrologer
Astronomer
Engineer
Inventor
Mathematician
Philosopher
Physicist
Polymath
Scientist
University Teacher
Galileo
G. Galilei
Wise
Ever
Pronounce
Must
Ingenious
Humane
Modest
Statement
Statements
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More quotes by Galileo Galilei

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But, because my private lectures and domestic pupils are a great hinderance and intteruption of my studies, I wish to live entirely exempt from the former, and in great measure from the latter. ... in short, I should wish to gain my bread from my writings.
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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.
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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...
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Philosophy is written in that great book which ever lies before our eyes — I mean the universe — but we cannot understand it if we do not first learn the language and grasp the symbols, in which it is written.
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See now the power of truth.
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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.
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Some, merely to contradict what I had said, did not scruple to cast doubt upon things they had seen with their own eyes again and again.
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There are those who reason well, but they are greatly outnumbered by those who reason badly.
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You can't teach anybody anything, only make them realize the answers are already inside them.
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It is very pious to say and prudent to affirm that the holy Bible can never speak untruth -- whenever its true meaning is understood. But I believe nobody will deny that it is often very abstruse, and may say things which are quite different from wha.
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They know that it is human nature to take up causes whereby a man may oppress his neighbor, no matter how unjustly. ... Hence they have had no trouble in finding men who would preach the damnability and heresy of the new doctrine from the very pulpit.
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You cannot teach a person something he does not already know, you can only bring what he does know to his awareness.
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Measure what can be measured, and make measureable what cannot be measured.
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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.
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I truly believe the book of philosophy to be that which stands perpetually open before our eyes, though since it is written in characters different from those of our alphabet it cannot be read by everyone.
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Mathematics is the language with which God has written the universe.
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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.
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Science proceeds more by what it has learned to ignore than what it takes into account.
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They who depend upon manifest observations will philosophize better than those who persist in opinions repugnant to the senses.
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I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations.
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