"I was measuring the heavens, now I must measure the shadows of the Earth. Though my soul was from the heavens, the shadow of my body lies here."

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

"The heavenly motions are nothing but a continuous song for several voices, perceived not by the ear but by the intellect."

"I would rather be a good Christian than a good astronomer."

"I confess that I have often erred in my youth, but I have always corrected my errors."