"Whereas in art nothing worth doing can be done without genius, in science even a very moderate capacity can contribute to a supreme achievement."

"Men who are unhappy, like men who sleep badly, are always proud of the fact."

"If there were in the world today any large number of people who desired their own happiness more than they desired the unhappiness of others, we could have paradise in a few years."

"Few people can be happy unless they hate some other person, nation, or creed."

"Three passions, simple but overwhelmingly strong, have governed my life: the longing for love, the search for knowledge, and unbearable pity for the suffering of mankind."

"The most savage controversies are those about matters as to which there is no good evidence either way."

"It seemed the world was divided into good and bad people. The good ones slept better... while the bad ones seemed to enjoy the waking hours much more."

"No flying machine will ever fly from New York to Paris ... [because] no known motor can run at the requisite speed for four days without stopping."

"As if you could kill time without injuring eternity."

"To cherish what remains of the Earth and to foster its renewal is our only legitimate hope of survival."

"When we got into office, the thing that surprised me the most was that things were as bad as we'd been saying they were."

"If you refuse where you have always granted you invite to theft."