Nicolaus Copernicus — "For it is the duty of an astronomer to compose the history of the celestial moti…"

"Therefore, we should not be surprised if the earth moves, for it is a planet, and all planets move."

"First of all, the world is spherical. This is because the sphere is the most perfect figure of all, and it is the form of the world."

"For the universe, wrought for us by the best and most orderly Workman of all, is a wonderful work."

"When, therefore, I had long considered the uncertainty of the traditional mathematical doctrines concerning the order of the spheres of the universe, I began to be annoyed that no more accurate explan…"

"Therefore, when I perceived that these and similar doubts arose concerning the order of the parts of the universe and the symmetry of its structure, I began to be vexed that no more definite explanati…"