“The animal is ignorant of the fact that he knows. The man is aware of the fact that he is ignorant.”

“A beetle may or may not be inferior to a man — the matter awaits demonstration; but if he were inferior by ten thousand fathoms, the fact remains that there is probably a beetle view of things of which a man is entirely ignorant. If he wishes to conceive that point of view, he will scarcely reach it by persistently revelling in the fact that he is not a beetle.”

“I know nothing except the fact of my ignorance.”

“Harshaw had the arrogant humility of the man who has learned so much that he is aware of his own ignorance and he saw no point in 'measurements' when he did not know what he was measuring.”

“The modern ignorance is in people's assumption that they can outsmart their own nature. It is in the arrogance that will believe nothing that cannot be proved, and respect nothing it cannot understand, and value nothing it cannot sell . . . The next hard time is just as real to him as the last, and so is the next blessing. The new ignorance is the same as the old, only less aware that ignorance is the same as the old, only less aware that ignorance is what it is. It is less humble, more foolish and frivolous, more dangerous. A man, Old Jack thinks, has no choice but to be ignorant, but he does not have to be a fool. He can know his place, and he can stay in it and be faithful.”

“The learned man understands the ignorant for he was once ignorant himself. The ignorant man does not understand the learned for he has never been learned himself.”