The squares of the periodic times are proportional to the cubes of the mean distances from the sun.

[God] is the kind Creator who brought forth nature out of nothing.

I had the intention of becoming a theologian...but now I see how God is, by my endeavors, also glorified in astronomy, for 'the heavens declare the glory of God.'

The sun alone appears, by virtue of his dignity and power, suited for this motive duty (of moving the planets) and worthy to become the home of God himself.

The Creator, the fountain of all wisdom, the approver of perpetual order, the eternal and superessential spring of geometry and harmonics.

I also ask you my friends not to condemn me entirely to the mill of mathematical calculations, and allow me time for philosophical speculations, my only pleasures.

The roads by which men arrive at their insights into celestial matters seem to me almost as worthy of wonder as those matters in themselves.