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If the moon and earth were not retained in their orbits by their animal force or some other equivalent, the earth would mount to the moon by a fifty-fourth part of their distance, and the moon fall towards the earth through the other fifty-three parts, and they would there meet, assuming, however, that the substance of both is of the same density.

— Johannes Kepler Astronomia nova (1609)

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More quotes by Johannes Kepler

Discover the force of the heavens O Men: Once recognised it can be put to use: No use could be seen in unknown things.

De fundamentis astrologiae certioribus (1601)

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

Geometry is one and eternal shining in the mind of God. That share in it accorded to humans is one of the reasons that humanity is the image of God.

Harmonices Mundi (1618)

God gives every animal the means of saving its life—why object if he gives astrology to the astronomer?

Joannis Kepleri Astronomi Opera Omnia (1858)

Given ships or sails adapted to the breezes of heaven, there will be those who will not shrink from even that vast expanse.

Dissertatio cum Nuncio Sidereo (1610)

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Quote text and notes from Wikiquote: Johannes Kepler (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.