Galileo Galilei-Astronomer

Born: 15 February 1564, Pisa, Italy
Died: 8 January 1642, Arcetri, Italy
Education: University of Pisa (1581–1585)
Discovered: Callisto, Europa, Ganymede, Rings of Saturn
Galileo Galilei was an Italian polymath: astronomer, physicist, engineer, philosopher, and mathematician, he played a major role in the scientific revolution of the seventeenth century.


  • You can't teach anybody anything, only make them realize the answers are already inside them.
  • We cannot teach people anything; we can only help them discover it within themselves.
  • To understand the Universe, you must understand the language in which it's written, the language of Mathematics.
  • In the sciences, the authority of thousands of opinions is not worth as much as one tiny spark of reason in an individual man.
  • Knowing thyself, that is the greatest wisdom.
  • All truths are easy to understand once they are discovered; the point is to discover them.
  • Mathematics is the language with which God has written the universe.
  • To be humane, we must ever be ready to pronounce that wise, ingenious and modest statement 'I do not know'.
  • 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.
  • With regard to matters requiring thought: the less people know and understand about them, the more positively they attempt to argue concerning them.
  • God is known by nature in his works, and by doctrine in his revealed word.
  • 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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