37 Galileo Galilei Quotes On Science, Mathematics, Universe and Life.

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Galileo di Vincenzo Bonaiuti de’ Galilei was born on 15 February 1564. commonly referred to as Galileo, was an Italian astronomer, physicist and engineer, sometimes described as a polymath, from the city of Pisa, then part of the Duchy of Florence. Galileo has been called the “father” of observational astronomy, modern physics, the scientific method and modern science. He died on 8 January 1642.
Source – Wikipedia.


37 Galileo Galilei Quotes On Science, Mathematics, Universe and Life:

  1. And yet it moves.

2. I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use.

3. Measure what is measurable, and make measurable what is not so.

4. In questions of science, the authority of a thousand is not worth the humble reasoning of a single individual.

5. All truths are easy to understand once they are discovered; the point is to discover them.

6. I notice that young men go to the universities in order to become doctors or philosophers or anything, so long as it is a title, and that many go in for those professions who are utterly unfit for them, while others who would be very competent are prevented by business or their daily cares, which keep them away from letters.

7. The sun, with all those planets revolving around it and dependent on it, can still ripen a bunch of grapes as if it had nothing else in the universe to do.

8. Nature is relentless and unchangeable, and it is indifferent as to whether its hidden reasons and actions are understandable to man or not.

9. I have never met a man so ignorant that I couldn’t learn something from him.


10. The Milky Way is nothing else but a mass of innumerable stars planted together in clusters.

11. We cannot teach people anything; we can only help them discover it within themselves.

12. If I were again beginning my studies, I would follow the advice of Plato and start with mathematics.

13. Philosophy is written in this grand book, the universe, which stands continually open to our gaze. But the book cannot be understood unless one first learns to comprehend the language and read the letters in which it is composed

14. Where the senses fail us, reason must step in.

15. Facts which at first seem improbable will, even on scant explanation, drop the cloak which has hidden them and stand forth in naked and simple beauty.

16. I think that in the discussion of natural problems we ought to begin not with the Scriptures, but with experiments, and demonstrations

17. Passion is the genesis of genius.

18. By denying scientific principles, one may maintain any paradox.

19. Who would set a limit to the mind of man? Who would dare assert that we know all there is to be known?


20. I give infinite thanks to God, who has been pleased to make me the first observer of marvelous things.

21. The nature of the human mind is such that unless it is stimulated by images of things acting upon it from without, all remembrance of them passes easily away.

22. It is surely harmful to souls to make it a heresy to believe what is proved.

23.. It vexes me when they would constrain science by the authority of the Scriptures, and yet do not consider themselves bound to answer reason and experiment.

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

25. We must say that there are as many squares as there are numbers. –

26. I esteem myself happy to have as great an ally as you in my search for truth. I will read your work … all the more willingly because I have for many years been a partisan of the Copernican view because it reveals to me the causes of many natural phenomena that are entirely incomprehensible in the light of the generally accepted hypothesis. To refute the latter I have collected many proofs, but I do not publish them, because I am deterred by the fate of our teacher Copernicus who, although he had won immortal fame with a few, was ridiculed and condemned by countless people (for very great is the number of the stupid).

27. He who looks the higher is the more highly distinguished, and turning over the great book of nature (which is the proper object of philosophy) is the way to elevate one’s gaze.

28. It is a beautiful and delightful sight to behold the body of the Moon.

29. Philosophy [nature] is written in that great book which ever is 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. The book is written in mathematical language, and the symbols are triangles, circles and other geometrical figures, without whose help it is impossible to comprehend a single word of it; without which one wanders in vain through a dark labyrinth.

30. Mathematics is the language in which God has written the universe.


31. For in the sciences the authority of thousands of opinions is not worth as much as one tiny spark of reason in an individual man. Besides, the modern observations deprive all former writers of any authority, since if they had seen what we see, they would have judged as we judge.

32. Names and attributes must be accommodated to the essence of things, and not the essence to the names, since things come first and names afterwards.

33. Wine is sunlight, held together by water.

34. See now the power of truth; the same experiment which at first glance seemed to show one thing, when more carefully examined, assures us of the contrary.

35. There are those who reason well, but they are greatly outnumbered by those who reason badly.


36. Long experience has taught me this about the status of mankind with regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them, while on the other hand to know and understand a multitude of things renders men cautious in passing judgment upon anything new.

37. 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?

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