“Human history is in essence a history of ideas.”

“It is not reasonable that those who gamble with men's lives should not pay with their own.”

“The only true measure of success is the ratio between what we might have done and what we might have been on the one hand, and the thing we have made and the things we have made of ourselves on the other.”

“Affliction comes to us, not to make us sad but sober; not to make us sorry but wise.”

“After people have repeated a phrase a great number of times, they begin to realize it has meaning and may even be true.”

“Heresies are experiments in man's unsatisfied search for truth.”

“Nothing leads so straight to futility as literary ambitions without systematic knowledge.”

“While there is a chance of the world getting through its troubles, I hold that a reasonable man has to behave as though he were sure of it. If at the end your cheerfulness in not justified, at any rate you will have been cheerful.”

“History is a race between education and catastrophe.”

“Human history in essence is the history of ideas.”

“In politics, strangely enough, the best way to play your cards is to lay them face upwards on the table.”