"I wish to persuade the wise and not to compel them."

"I have loved the stars too fondly to be fearful of the night."

"I hold the sun to be situated motionless in the center of the revolution of the celestial orbs while the earth revolves around the sun."

"The book of nature is written in the language of mathematics."

"The senses, being the interpreters of natural effects, are the only door to scientific knowledge."