"The human race may well become extinct before the end of the century."

"The good life, as I conceive it, is a happy life. I do not mean that if you are good you will be happy - I mean that if you are happy you will be good."

"So far as I can remember, there is not one word in the Gospels in praise of intelligence."

"A sense of duty is useful in work, but offensive in personal relations. People wish to be liked, not be endured with patient resignation."

"The time you enjoy wasting is not wasted time."

"The wise man thinks about his troubles only when there is some purpose in doing so; at other times he thinks about others things."

"A little and a little, collected together, become a great deal; the heap in the barn consists of single grains, and drop and drop makes an inundation."

"The mind is its own place, and in itself can make a Heav'n of Hell, a Hell of Heav'n."

"No one should drive a hard bargain with an artist."

"It is inexcusable for scientists to torture animals; let them make their experiments on journalists and politicians."

"She just came in, pounced around this thing with me for a few years enjoyed herself, gave it a sort of beautiful quality and left. Excited a few men in the meantime."

"Freedom is not worth having if it does not include the freedom to make mistakes."