"For it is the duty of an astronomer to gather by careful and skilled observation the history of the celestial movements, and then to investigate their causes or hypotheses about them, and then to pred…"

"It is clear that the earth also moves in a similar manner, and describes an annual course."

"The earth has a spherical shape, for it is bounded on all sides by the circumference of a circle."

"Therefore, we should not be surprised if the earth moves, for it is a planet, and all planets move."

"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."