In theology we must consider the predominance of authority; in philosophy the predominance of reason.

...Those laws are within the grasp of the human mind. God wanted us to recognize them by creating us after his own image so that we could share in his own thoughts... and if piety allow us to say so, our understanding is in this respect of the same kind as the divine, at least as far as we are able to grasp something of it in our mortal life.

Repudiating the sensible world, which he neither sees himself nor believes from those who have, the Peripatetic joins combat by childish quibbling in a world on paper, and denies the Sun shines because he himself is blind.

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.

It may be well to wait a century for a reader, as God has waited six thousand years for an observer.

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

If my false figures came near to the facts, this happened merely by chance ... These comments are not worth printing. Yet it gives me pleasure to remember how many detours I had to make, along how many walls I had to grope in the darkness of my ignorance until I found the door which lets in the light of the truth ... In such manner did I dream of the truth.