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.
Copy Quote View & ShareIn so many and such important ways, then, do the planets bear witness to the earth's mobility.
Copy Quote View & ShareI 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.
Copy Quote View & ShareFor it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study.
Copy Quote View & ShareTherefore, 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.
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