Galileo Galilei Quotes

Galileo Galilei (Italian pronunciation: [?ali?l??o ?ali?l?i]; 15 February 1564 – 8 January 1642), was an Italian astronomer, physicist, engineer, philosopher, and mathematician who played a major role in the scientific revolution during the Renaissance. Galileo has been called the "father of observational astronomy", the "father of modern physics", and the "father of science". His contributions to observational astronomy include the telescopic confirmation of the phases of Venus, the discovery of the four largest satellites of Jupiter (named the Galilean moons in his honour), and the observation and analysis of sunspots. Galileo also worked in applied science and technology, inventing an improved military compass and other instruments.

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Galileo Galilei


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

Galileo Galilei


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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.

Galileo Galilei


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The Bible shows the way to go to heaven, not the way the heavens go.

Galileo Galilei


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

Galileo Galilei


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

Galileo Galilei


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I therefore concluded, and decided unhesitatingly, that there are three stars in the heavens moving about Jupiter, as Venus and Mercury about the Sun; which at length was established as clear as daylight by numerous other observations. Referring to his pioneering telescope observations.

Galileo Galilei


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[Copernicus] did not ignore the Bible, but he knew very well that if his doctrine were proved, then it could not contradict the Scriptures when they were rightly understood.

Galileo Galilei


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Among the great men who have philosophized about [the action of the tides], the one who surprised me most is Kepler. He was a person of independent genius, [but he] became interested in the action of the moon on the water, and in other occult phenomena, and similar childishness.

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

Galileo Galilei


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I wish, my dear Kepler, that we could have a good laugh together at the extraordinary stupidity of the mob. What do you think of the foremost philosophers of this University? In spite of my oft-repeated efforts and invitations, they have refused, with the obstinacy of a glutted adder, to look at the planets or the Moon or my glass [telescope].

Galileo Galilei


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Scripture is a book about going to Heaven. It's not a book about how the heavens go.

Galileo Galilei


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Measure what can be measured, and make measureable what cannot be measured.

Galileo Galilei


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Holy Scripture could never lie or err...its decrees are of absolute and inviolable truth.

Galileo Galilei


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Holy Writ was intended to teach men how to go to Heaven not how the heavens go.

Galileo Galilei


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The number of people that can reason well is much smaller than those that can reason badly. If reasoning were like hauling rocks, then several reasoners might be better than one. But reasoning isn't like hauling rocks, it's like, it's like racing, where a single, galloping Barbary steed easily outruns a hundred wagon-pulling horses.

Galileo Galilei


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