Kon.: What is meant by “the heaven and the earth: mount up to heaven, be worthy of heaven”?

Cu Su.: ’Tis but stupidity, there is no heaven; each planet is surrounded by its atmosphere, and rolls in space around its sun. Each sun is the centre of several planets which travel continually around it. There is no up nor down, ascension nor descent. You perceive that if the inhabitants of the moon said that some one ascended to the earth, that one must render himself worthy of earth, he would talk nonsense. We do so likewise when we say we must be worthy of heaven; it is as if we said we must be worthy of air, worthy of the constellation of the Dragon, worthy of space.—CatÉchisme chinois.