"Truth is the daughter of time, and I feel no shame in being her midwife."

"Temporis filia veritas; cui me obstetricari non pudet."

"I used to measure the heavens, now I measure the shadows of Earth. Although my mind was heaven-bound, the shadow of m…"

"My goal is to show that the heavenly machine is not a kind of divine living being but similar to a clockwork insofar …"

"Nature uses as little as possible of anything."

"The die is cast; I have written my book; it will be read either in the present age or by posterity, it matters not wh…"

"In Terra inest virtus, quae Lunam del."

"There is a force in the earth which causes the moon to move."

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

"The earth is the sphere, the measure of all; round it describe a dodecahedron; the sphere including this will be Mars…"