La mayor sabiduría que existe es conocerse a uno mismo. - Galileo Galilei

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

My dear Kepler, I wish that we might laugh at the stupidity of the human herd. What do you have to say about the principal philosophers of this academy who are filled with the stubbornness of an asp and do not want to look at either the planets, the moon or the telescope, even though I have freely and deliberately offered them the opportunity a thousand times? Truly, just as the asp stops its ears, so do these philosophers shut their eyes to the light of truth.

La matematica è l'alfabeto nel quale Dio ha scritto l'universo.