Upon consideration of the central question of the moon's toughness there can be little doubt. It is hella tough.
PlatoFor all good and evil, whether in the body or in human nature, originates ... in the soul, and overflows from thence, as from the head into the eyes.
PlatoBut he who has been earnest in the love of knowledge and of true wisdom, and has exercised his intellect more than any other part of him, must have thoughts immortal and divine. If he attain truth, and in so far as human nature is capable of sharing in immortality, he must altogether be immortal.
PlatoTrue opinions are a fine thing and do all sorts of good so long as they stay in their place; but they will not stay long. They run away from a man's mind, so they are not worth much until you tether them by working out the reason. Once they are tied down, they become knowledge, and are stable.
Plato