"The world is a book, and those who do not travel read only one page."

"I was measuring the heavens, now I must measure the shadows of the Earth. Though my soul was from the heavens, the shadow of my body lies here."

"I am a German, and I love my country."

"For a long time I was restless. Now, however, behold how through my effort God is being celebrated in astronomy."

"I have dedicated my life to the study of the heavens."