Gravity is a mutual affection between cognate bodies towards union or conjunction (similar in kind to the magnetic virtue), so that the earth attract… - Johannes Kepler

If the earth were not round, heavy bodies would not tend from every side in a straight line towards the center of the earth, but to different points from different sides.

Advertencia para idiotas. Pero a todo aquel que sea demasiado estúpido para comprender la ciencia astronómica, o demasiado pusilánime para creer a Copérnico sin que afecte a su fe, le aconsejaría que, una vez renunciado a los estudios astronómicos, y tras haber condenado todos aquellos estudios filosóficos que le plazca, se preocupe de sus asuntos y se vaya a su casa a escarbar su terruño

Just as the eye was made to see colours, and the ear to hear sounds, so the human mind was made to understand, not whatever you please, but quantity.