I am a Lutheran astrologer, I throw away the nonsense and keep the hard kernel.

The heavenly motions... are nothing but a continuous song for several voices, perceived not by the ear but by the intellect, a figured music which sets landmarks in the immeasurable flow of time.

O telescope, instrument of much knowledge, more precious than any sceptre!

...for a long time I wanted to become a theologian... now, however, behold how through my efforts God is being debated in astronomy.

I much prefer the sharpest criticism of a single intelligent man to the thoughtless approval of the masses.

As soon as somebody demonstrates the art of flying, settlers from our species of man will not be lacking on the Moon and Jupiter. Who would have believed that a huge ocean could be crossed more peacefully and safely than the the narrow expanse of the Adriatic, the Baltic Sea or the English Channel? Given ships or sails adapted to the breezes of heaven, there will be those who will not shrink from even that vast expanse.

When ships to sail the void between the stars have been built, there will step forth men to sail these ships.