“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.”
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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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Pouring forth its seas everywhere, then, the ocean envelops the earth and fills its deeper chasms.
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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.
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Those things which I am saying now may be obscure, yet they will be made clearer in their proper place.
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