Galileo Galilei

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

Sun

Enthusiastic people experience life from the inside out.

Knowing

You cannot teach a man anything,
you can only help him find it within himself.

Nature

There is not a single effect in Nature, not even the least that exists, such that the most ingenious theorists can ever arrive at a complete understanding of it. 

This vain presumption of understanding

This vain presumption of understanding everything can have no other basis than never understanding anything. For anyone who had experienced just once the perfect understanding of one single thing, and had truly tasted how knowledge is attained, would recognise that of the infinity of other truths he understands nothing.

Who would set a limit to the mind?

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

Knowing thyself, that is the greatest wisdom.

Life

Knowing thyself,
that is the greatest wisdom.

We should accept misfortune not only in thanks, but in infinite gratitude to providence

What ever the course of our lives, we should recieve them as the highest gift from the hand of God, in which equally reposed the power to do nothing whatever for us. Indeed, we should accept misfortune not only in thanks, but in infinite gratitude to Providence, which by such means detaches us from an excessive love for Earthly things and elevates our minds to the celestial and divine.

With regard to matters requiring thought

With regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them.

Increase of known truths stimulates the investigation, establishment and growth of the arts

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

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

Nature

Nothing occurs contrary to nature except the impossible, and that never occurs.

Nature does not act by means of many things

Nature...does not act by means of many things when it can do so by means of a few.

Nature is relentless and unchangeable

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

The sun

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.

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

Philosophy

It's the mathematicians you have to trust.

What has philosophy got to do with measuring anything?

What has philosophy got to do with measuring anything? It's the mathematicians you have to trust, and they measure the skies like we measure a field.

Philosophy is written in that great book which ever lies before our eyes — I mean the universe

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.

Thank those who have shown you the truth

In regard to the philosophers, if they be true philosophers, i.e., lovers of truth, they should not be irritated that the earth moves. 

Rather, if they realize that they have held a false belief, they should thank those you have shown them the truth; and if their opinion stands firm that the earth doesn't move, they will have reason to boast than be angered.

I have never met a man so ignorant

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

The wise, ingenious and modest statement 'I do not know'

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

Mathematics is the key and door to the sciences.

Reason

Where the senses fail us,
reason must step in.

Gof has given us our senses, reason, and intelligence

I do not think it is necessary to believe that the same God who has given us our senses, reason, and intelligence wished us to abandon their use, giving us by some other means the information that we could gain through them.

The number of people that can reason well

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.

There are those who reason well

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

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

Science

Two truths cannot contradict one another.

The Sun remains fixed in the centre of the circle of heavenly bodies

In my studies of astronomy and philosophy I hold this opinion about the universe, that the Sun remains fixed in the centre of the circle of heavenly bodies, without changing its place; and the Earth, turning upon itself, moves round the Sun.

In questions of science

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

Mathematics is the language of God

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

All truths are easy to understand

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

See now the power of truth

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.

If the Earth were not subject to any change I would consider the Earth a big but useless body in universe, paralyzed...superfluous and unnatural. 

Those who so exalt incorruptibility, unchangeability and the like, are, I think, reduced to saying such things both because of inordinate desire they have to live for a long time and because of the terror they have of death...they do not realize that if men were immortal, they would have never come into the world.

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