"Each day of not writing, of comfort, of being that which he despised, dulled his ability and softened his will to work so that, finally, he did no work at all."

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Among the authorities it is generally agreed that the Earth is at rest in the middle of the universe, and they regard it as inconceivable and even ridiculous to hold the opposite opinion. However, if we consider it more closely the question will be seen to be still unsettled, and so decidedly not to be despised. For every apparent change in respect of position is due to motion of the object observed, or of the observer, or indeed to an unequal change of both.

— Nicolaus Copernicus