"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."

"I do not believe that the same God who has given us senses, reason and intellect would have us abandon their use."

"The deeper we penetrate into the universe, the more we realize that it is written in the language of mathematics."

"The purpose of science is not to open the door to infinite wisdom, but to set a limit to infinite error."

"I think that in the discussion of natural problems we ought not to begin at the authority of places of Scripture, but at sensible experiments and necessary demonstrations."