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

Now, as God the maker play'd he taught the game to Nature whom he created in his image; taught her the selfsame game which he played to her.

It is a right, yes a duty, to search in cautious manner for the numbers, sizes, and weights, the norms for everything [God] has created. For He himself has let man take part in the knowledge of these things ... For these secrets are not of the kind whose research should be forbidden; rather they are set before our eyes like a mirror so that by examining them we observe to some extent the goodness and wisdom of the Creator.

My greatest desire is that I may perceive the God whom I find everywhere in the external world, in like manner also within and inside myself.

Eyesight should learn from reason.

The moon... is a mass, akin to the mass of the earth, attracts the waters by a magnetic force, not because they are liquid, but because they possess earthy substance, and so share in the movements of a heavy body.

The heavenly motions... are nothing but a continuous song for several voices, perceived not by the ear but by the intellect, a figured music which sets landmarks in the immeasurable flow of time.