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. – Nicolaus Copernicus
For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study. – Nicolaus Copernicus
Although all the good arts serve to draw mans mind away from vices and lead it toward better things, this function can be more fully performed by this art, which also provides extraordinary intellectual pleasure. – Nicolaus Copernicus
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. – Nicolaus Copernicus