Who said “To be ignorant of one's ignorance is the malady of the ignorant.”?

“Where ignorance is bliss, 'Tis folly to be wise.”

“Everybody is ignorant -- only on different subjects.”

“Nothing in the world is more dangerous than sincere ignorance and conscientious stupidity.”

“I do not pretend to know where many ignorant men are sure -- that is all that agnosticism means.”

“Ignorance breeds monsters to fill up all the vacancies of the soul that are unoccupied by the verities of knowledge.”

“Our ideals are our better selves.”

“One must be a wise reader to quote wisely and well.”

“Strengthen me by sympathizing with my strength, not my weakness.”

“The less routine the more life.”

“Where there is a mother in the home, matters go well.”

“Who knows, the mind has the key to all things besides.”