"All truths are easy to understand once they are discovered; the point is to discover them."
"When the moon is ninety degrees away from the sun it sees but half the earth illuminated (the western half). For the other (the eastern half) is enveloped in night. Hence the moon itself is illuminated less brightly from the earth, and as a result its secondary light appears fainter to us."
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Source: Discoveries and Opinions of Galileo. Book by Galileo Galilei, 1957.
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More quotes by Galileo Galilei
"I have never met a man so ignorant that I couldn't learn something from him."
"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."
"I do not feel obliged to believe that the same God who has endowed us with senses, reason, and intellect has intended us to forego their use."
"The laws of nature are written by the hand of God in the language of mathematics."
"Knowing thyself, that is the greatest wisdom."