"To be ignorant of one's ignorance is the malady of the ignorant."

"Our No. 1 enemy is ignorance. And I believe that is the No. 1 enemy for everyone — it's not understanding what actual…"

"You have to start with the truth. The truth is the only way that we can get anywhere. Because any decision-making tha…"

"Ignorance can be interesting. ∞ Also fatal."

"Any wise enemy is better than an ignorant friend."

"Be ignorance thy choice, where knowledge leads to woe."

"It is not my place to tell you whether there is indefeasible ignorance of ultimate reality. I am ignorant of whether …"

"A large segment of the American public is sadly deficient in its knowledge of basic business and economic facts of li…"

"It’s amazing how self-perpetuating ignorance is."

"Ignorance, madam, pure ignorance."