I can easily conceive, most Holy Father, that as soon as some people learn that in this book which I have written concerning the revolutions of the heavenly bodies, I ascribe certain motions to the Earth, they will cry out at once that I and my theory should be rejected.
The natural movement of one's soul is upwards. But just as any object is dragged down when a heavy weight is tied to it, the burden of the body drags down the soul.