"Why do you say that a celestial body, which is unchanging with respect to its matter, cannot be moved by assent alone? For if the celestial bodies are neither heavy nor light, but most suited for circular movement, then do they resist the motor mind? Even if a celestial globe is not heavy in the way in which a stone on the earth is... and is not light in the way in which among us fire is... nevertheless by reason of its matter it has a natural... powerlessness of crossing from place to place, and it has a natural inertia or rest whereby it rests... where it is placed alone. ...[I]n order that it may be moved out of its... rest, it has need of some power... stronger than its matter and its naked body, and which should overcome its natural inertia. For such a faculty is above the capacity of nature and is a sprout of form, or a sign of life."
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Epitome Astronomiae Copernicanae
' was an astronomy book on the published by Johannes Kepler in the period 1618 to 1621. The first volume (books I–III) was printed in 1618, the second (book IV) in 1620, and the third (books V–VII) in 1621. It was translated from the Latin in 1939 by .
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