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Danh ngôn của Johannes Kepler (Sứ mệnh: 9)

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.
Planets move in ellipses with the Sun at one focus.
Nature uses as little as possible of anything.
Truth is the daughter of time, and I feel no shame in being her midwife.