Galileo Galilei
Father of modern observational astronomy
Sayings by Galileo Galilei
The great book of nature is written in mathematical symbols.
It is a beautiful thing to know that the heavens are not immutable.
The senses, assisted by reason, are the source of all our knowledge.
I consider the sun's axial rotation to be an excellent argument for the diurnal rotation of the earth.
To apply oneself to a search for the truth, without any intent to serve some predetermined end, is the true path to discovery.
The motion of the earth is a fact, not a theory.
I am about to take leave of this earth, and I can say that I have seen more wonders than any man before me.
The greatest wisdom is to know oneself.
Nature does not make leaps.
Ignorance is the parent of fear.
It is necessary to examine the actual structure of the universe, and not to cling to old ideas.
The universe is an immense, an incomparable, and an inexhaustible library.
Truly, if there were no other way to demonstrate the motion of the Earth, the tides alone would suffice.
I know that I am mortal, and that my life will pass away like a shadow; but I hope that my discoveries will live on.
The Bible shows the way to go to heaven, not the way the heavens go.
All truths are easy to understand once they are discovered; the point is to discover them.
You cannot teach a man anything; you can only help him find it within himself.
To understand the universe, you must understand the language in which it's written. And that language is mathematics.
It is surely harmful to souls to make it a heresy to believe what has been proved.
The greatest wisdom consists in knowing what is truly useful.