“Then only will you see it, when you cannot speak of it; for the knowledge of it is deep silence, and suppression of all the senses. […] Knowledge differs greatly from sense-perception. Sense-perception takes place when that which is material has the mastery; and it uses the body as its organ, for it cannot exist apart from the body. But knowledge is incorporeal; the organ which it uses is the mind itself.”

— Hermes Trismegistus