The earth together with its surrounding waters must in fact have such a shape as its shadow reveals, for it eclipses the moon with the arc of a perfe… - Nicolaus Copernicus

If perchance there should be foolish speakers who, together with those ignorant of all mathematics, will take it upon themselves to decide concerning these things, and because of some place in the Scriptures wickedly distorted to their purpose, should dare to assail this my work, they are of no importance to me, to such an extent do I despise their judgment as rash. For it is not unknown that Lactantius, the writer celebrated in other ways but very little in mathematics, spoke somewhat childishly of the shape of the earth when he derided those who declared the earth had the shape of a ball. So it ought not to surprise students if such should laugh at us also. Mathematics is written for mathematicians to whom these our labors, if I am not mistaken, will appear to contribute something even to the ecclesiastical state the headship of which your Holiness now occupies.(Author's preface to de revolutionibus)

For I am not so enamored of my own opinions that I disregard what others may think of them. I am aware that a philosopher's ideas are not subject to the judgment of ordinary persons, because it is his endeavor to seek the truth in all things, to the extent permitted to human reason by God. Yet I hold that completely erroneous views should be shunned. Those who know that the consensus of many centuries has sanctioned the conception that the earth remains at rest in the middle of the heaven as its center would, I reflected, regard it as an insane pronouncement if I made the opposite assertion that the earth moves.

...Bana öyle geliyor ki, Pythagorasçılar bazılarının düşündüğü gibi, öğretilerini paylaşmaktan duydukları kıskançlıktan değil de, büyük insanlara ait böylesine güzel ve binbir zorlukla dolu keşif, maddî bir kazancı olmaksızın kalem oynatmayı sıkıcı bulan ya da başkalarının yüreklendirip örnek olmasıyla hür felsefe çalışmasına özendirilse de aklî donukluklarından ötürü filozoflar arasında tıpkı bal arılarının arasındaki erkek arılar gibi duran kişilerce hor görülmesin diye böyle yapıyordu.