Smoke like a chimney, work like a horse, eat without thinking, go for a walk only in really pleasant company.

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

There is only one road to human greatness: through the school of hard knocks.

Never regard study as a duty, but as the enviable opportunity to learn

Nothing will end war unless the peoples themselves refuse to go to war.

I see in Nature a magnificent structure... that must fill a thinking person with a feeling of humility.

To one bent on age, death will come as a release. I feel this quite strongly now that I have grown old myself and have come to regard death like an old debt, at long last to be discharged.