"When you speak, think that the Wold of Speech is at work within you, for without that presence, you would not be able to speak at all. Similarly, you would not think at all were it not for the wold of thought within you. Man is like a ram's horn; the only sound he makes is that which is blown through him. Were there no one blowing the horn, there would be no sound at all."
Maggid Devaraw Le-Ya'aqov
Quoted in Gateways to the Otherworld, Philip Gardiner, page 220