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 CopernicusTherefore, 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.
Nicolaus CopernicusFor I am not so enamoured of my own opinions that I disregard what others may think of them.
Nicolaus CopernicusMoreover, since the sun remains stationary, whatever appears as a motion of the sun is really due rather to the motion of the earth.
Nicolaus CopernicusThose things which I am saying now may be obscure, yet they will be made clearer in their proper place.
Nicolaus Copernicus