Galileo Galilei Quotes from Wisdom-of-the-Wise.com

"Where the senses fail us, reason must step in."

"Mathematics is the key and door to the sciences."

"Measure what is measurable, and make measurable what is not so."

"Mathematics is the language with which God has written the universe."

"I have never met a man so ignorant that I could not learn something from him."

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

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

"The intention of the Holy Spirit is to teach us how one goes to heaven, not how the heavens go."

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

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

"If you could see the earth illuminated when you were in a place as dark as night, it would look to you more splendid than the moon."

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

"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."

"Nature … is inexorable and immutable; she never transgresses the laws imposed upon her, or cares a whit whether her abstruse reasons and methods of operation are understandable to men."

"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. This book is written in the mathematical language, and the symbols are triangles, circles and other geometrical figures, without whose help it is impossible to comprehend a single word of it; without which one wanders in vain through a dark labyrinth."