"Therefore, if any motions are attributed to the earth, they must produce in the celestial phenomena an appearance exactly the reverse of that which is observed."

"For these I care nothing, and I shall even despise their judgment as reckless."

"Indeed, I am aware that a philosopher's thoughts are far removed from the judgment of the multitude, for his aim is to seek the truth in all things, to the extent permitted to human reason by God."

"To attack me, some people, who know nothing of mathematics, yet dare to pass judgment on these things, on the strength of some passage of Scripture, twisted to their purpose, are now presumptuously at…"

"I consider it the chief duty of an astronomer to gather the observations of the heavenly bodies, and to explain their motions by hypotheses."