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"We regard it as a certainty that the earth, enclosed between poles, is bounded by a spherical surface."
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"I am certain there is too much certainty in the world."

"Certitude is not the test of certainty. We have been cocksure of many things that were not so."

"Many slaves on this continent are oppressed, and their cries have reached the ears of the Most High. Such are the purity and certainty of his judgments, that he cannot be partial in our favor."

"Could we have prevented in 100% certainty? I don't think anything is that certain. However, we would have had a very, very good chance for preventing it."

"In these matters the only certainty is that nothing is certain."

"If a man fights his way through his doubts to the conviction that Jesus Christ is Lord, he has attained to a certainty that the man who unthinkingly accepts things can never reach."
Explore more quotes by Nicolaus Copernicus

"More stars in the north are seen not to set, while in the south certain stars are no longer seen to rise."

"So, influenced by these advisors and this hope, I have at length allowed my friends to publish the work, as they had long besought me to do."

"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."

"Pouring forth its seas everywhere, then, the ocean envelops the earth and fills its deeper chasms."

"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."

"The massive bulk of the earth does indeed shrink to insignificance in comparison with the size of the heavens."
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