"All truths are easy to understand once they are discovered; the point is to discover them."
"We see only the simple motion of descent, since that other circular one common to the Earth, the tower, and ourselves remains imperceptible. There remains perceptible to us only that of the stone, which is not shared by us; and, because of this, sense shows it as by a straight line, always parallel to the tower, which is built upright and perpendicular upon the terrestrial surface."
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Source: Letter to the Grand Duchess Christina, 1615.
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"I have never met a man so ignorant that I couldn't learn something from him."
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