When ships to sail the void between the stars have been built, there will step forth men to sail these ships.

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.

The diversity of the phenomena of nature is so great, and the treasures hidden in the heavens so rich, precisely in order that the human mind shall never be lacking in fresh nourishment.

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 wisdom of the Lord is infinite as are also His glory and His power. Ye heavens, sing His praises; sun, moon, and planets, glorify Him in your ineffable language! Praise Him, celestial harmonies, and all ye who can comprehend them! And thou, my soul, praise thy Creator! It is by Him and in Him that all exist.

...for a long time I wanted to become a theologian... now, however, behold how through my efforts God is being debated in astronomy.

If God himself has waited six thousand years for someone to contemplate his works, my book can wait for a hundred.