“Let there be nothing untried; for nothing happens by itself, but men obtain all things by trying.”

“That men do not learn very much from the lessons of history is the most important of all the lessons of history.”

“The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd; indeed in view of the silliness of the majority of mankind, a widely spread belief is more likely to be foolish than sensible.”

“But this I know: if all mankind were to take their troubles to market with the idea of exchanging them, anyone seeing what his neighbor's troubles were like would be glad to go home with his own.”

“The most hateful grief of all human griefs is to have knowledge of a truth, but no power over the event.”

“The secret of success is that it is not the absence of failure, but the absence of envy.”

“If a man insisted always on being serious, and never allowed himself a bit of fun and relaxation, he would go mad or become unstable without knowing it.”