Patience serves as a protection against wrongs as clothes do against cold.
Who would believe that so small a space could contain the images of all the universe?
He turns not back who is bound to a star.
The variety of colour in objects cannot be discerned at a great distance, excepting in those parts which are directly lighted up by the solar rays.
The Book of the science of Mechanics must precede the Book of useful inventions.
If you find from your own experience that something is a fact and it contradicts what some authority has written down, then you must abandon the authority and base your reasoning on your own findings.