I demonstrate by means of philosophy that the earth is round, and is inhabited on all sides; that it is insignificantly small, and is borne through the stars.
Johannes Kepler

Nature uses as little as possible of anything.
Johannes Kepler

Planets move in ellipses with the Sun at one focus.
Johannes Kepler

The diversity of the phenomena of nature is so great, and the treasures hidden in the heavens so rich, precisely in order that the human mind shall never be lacking in fresh nourishment.
Johannes Kepler

The radius vector describes equal areas in equal times.
Johannes Kepler

The squares of the periodic times are to each other as the cubes of the mean distances.
Johannes Kepler

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