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

There will certainly be no lack of human pioneers when we have mastered the art of flight....Let us create vessels and sails justed to the heavenly ether, and there will be plenty of people unafraid of the empty wastes. In the meantime we shall prepare, for the brave sky-travelers, maps of the celestial bodies.

The squares of the periodic times are proportional to the cubes of the mean distances from the sun.

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

Science is the process of thinking God's thoughts after Him.

Astronomy would not provide me with bread if men did not entertain hopes of reading the future in the heavens.

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