The Earth is round, and is inhabited on all sides, is insignificantly small, and is borne through the stars. - Johannes Kepler

[N]either this nor that supposition is worthy of the name of an astronomical hypothesis, but rather that which is implied in both alike.

I used to measure the skies, now I measure the shadows of Earth.
Although my mind was sky-bound, the shadow of my body lies here.

[Epitaph he composed for himself a few months before he died]

If the earth should cease to attract its waters to itself all the waters of the sea would be raised and would flow to the body of the moon.