“The only animal from which humans have nothing to learn, in fact, is the sheep. Humans have already learned everything the sheep's got to teach.”

“We laugh at sheep because sheep just follow the one in front. We humans have out-sheeped the sheep, because at least the sheep need a sheep dog to keep them in line. Humans keep each other in line. And they do it by ridiculing or condemning anyone who commits the crime, and that’s what it’s become, of being different.”

“For a human being, nothing comes naturally,' said Grumman. 'We have to learn everything we do.”

“Humans have come into being for the sake of each other, so either teach them, or learn to bear them.”

“Whatever he learned from me, I learned well from Leonardo that teaching is a matter of drawing out from men what is already in their hearts, and that men learn only what they want to.”

“It is a known fact that the sheep that give us steel wool have no natural enemies.”