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.
I much prefer the sharpest criticism of a single intelligent man to the thoughtless approval of the masses.
Planets move in ellipses with the Sun at one focus.
The radius vector describes equal areas in equal times.
Truth is the daughter of time, and I feel no shame in being her midwife.
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.
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