“Ignorance is a tough evil to conquer.”

“There is no sin but ignorance.”

“Of all the frictional resistances, the one that most retards human movement is ignorance.”

“Reality cannot be ignored except at a price; and the longer the ignorance is persisted in, the higher and more terrible becomes the price that must be paid.”

“Mutual ignorance breeds mutual distrust.”

“Our happiness depends on wisdom all the way.”

“Always desire to learn something useful.”