"Let me not seem to have lived in vain."

"When on the above mentioned day [November 11], a little before dinner...I was returning to that house, and during my …"

"An astronomer must be cosmopolitan because ignorant statesmen can not be expected to value their services."

"Those who study the stars have God for a teacher."

"For it is now quite clear to me that there are no solid spheres in the heavens."

"But there really are not any spheres in the heavens...and those which have been devised by the authors to save the ap…"

"Simplicibus itaque verbis gaudet Mathematica Veritas, cum etiam per se simplex sit Veritatis oratio."

"Weder hohe Ämter, noch Macht, einzig die Zepter der Wissenschaft überdauern."

"Nicht scheinen, sondern sein."

"Lass mein Leben nicht vergeblich gewesen sein."