“A man remains ignorant because he loves ignorance, and chooses ignorant thoughts; a man becomes wise because he loves wisdom and chooses wise thoughts.”

“When a wise man does not understand, he says: "I do not understand." The fool and the uncultured are ashamed of their ignorance. They remain silent when a question could bring them wisdom.”

“I rememeber asking a wise man, once . . . 'Why do Men fear the dark?' . . . 'Because darkness' he told me, 'is ignorance made visible.' 'And do Men despise ignorance?' I asked. 'No,' he said, 'they prize it above all things--all things!--but only so long as it remains invisible.”

“Travel brings wisdom only to the wise. It renders the ignorant more ignorant than ever.”

“True wisdom is less presuming than folly. The wise man doubteth often, and changeth his mind; the fool is obstinate, and doubteth not; he knoweth all things but his own ignorance.”

“There are many things of which a wise man might wish to be ignorant”