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.
I can easily conceive, most Holy Father, that as soon as some people learn that in this book which I have written concerning the revolutions of the heavenly bodies, I ascribe certain motions to the Earth, they will cry out at once that I and my theory should be rejected.
Not a few other very eminent and scholarly men made the same request, urging that I should no longer through fear refuse to give out my work for the common benefit of students of Mathematics.
Of all things visible, the highest is the heaven of the fixed stars.
The massive bulk of the earth does indeed shrink to insignificance in comparison with the size of the heavens.
At rest, however, in the middle of everything is the sun.
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.
Accordingly, since nothing prevents the earth from moving, I suggest that we should now consider also whether several motions suit it, so that it can be regarded as one of the planets. For, it is not the center of all the revolutions.
For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study.
Mathematics is written for mathematicians.
For I am not so enamoured of my own opinions that I disregard what others may think of them.
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.
Those things which I am saying now may be obscure, yet they will be made clearer in their proper place.
Near the sun is the center of the universe.
Pouring forth its seas everywhere, then, the ocean envelops the earth and fills its deeper chasms.
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