“To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge."
"Therefore I would not have it unknown to Your Holiness, the the only thing which induced me to look for another way of reckoning the movements of the heavenly bodies was that I knew that mathematicians by no means agree in their investigation thereof."
"For a traveler going from any place toward the north, that pole of the daily rotation gradually climbs higher, while the opposite pole drops down an equal amount."
"Of all things visible, the highest is the heaven of the fixed stars."
"Mathematics is written for Mathematicians."
"I shall now recall to mind that the motion of the heavenly bodies is circular, since the motion appropriate to a sphere is rotation in a circle."
"Moreover, there is no difference between the earth's centers of gravity and magnitude."
"Therefore, in the course of the work I have followed this plan: I describe in the first book all the positions of the orbits together with the movements which I ascribe to the Earth, in order that this book might contain, as it were, the general scheme of the universe."
"Yet if anyone believes that the earth rotates, surely he will hold that its motion is natural, not violent."
- "More stars in the north are seen not to set, while in the south certain stars are no longer seen to rise."
- "I am aware that a philosopher's ideas are not subject to the judgment of ordinary persons, because it is his endeavour to seek the truth in all things, to the extent permitted to human reason by God."
- "For I am not so enamoured of my own opinions that I disregard what others may think of them."
- "So far as hypotheses are concerned, let no one expect anything certain from astronomy, which cannot furnish it, lest he accept as the truth ideas conceived for another purpose, and depart from this study a greater fool than when he entered it."
"Those who know that the consensus of many centuries has sanctioned the conception that the earth remains at rest in the middle of the heavens as its center, would, I reflected, regard it as an insane pronouncement if I made the opposite assertion that the earth moves."
"Therefore, when I considered this carefully, the contempt which I had to fear because of the novelty and apparent absurdity of my view, nearly induced me to abandon utterly the work I had begun."
"Moreover, since the sun remains stationary, whatever appears as a motion of the sun is really due rather to the motion of the earth."
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