*Before God we are all equally wise – and equally foolish.
*Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.
*Ethical axioms are found and tested not very differently from the axioms of science. Truth is what stands the test of experience.
*Every day I remind myself that my inner and outer life are based on the labors of other men, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving.
*Few people are capable of expressing with equanimity opinions which differ from the prejudices of their social environment. Most people are even incapable of forming such opinions.
*Gravitation cannot be held responsible for people falling in love. How on earth can you explain in terms of chemistry and physics so important a biological phenomenon as first love? Put your hand on a stove for a minute and it seems like an hour. Sit with that special girl for an hour and it seems like a minute. That’s relativity.
*I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
*I never teach my pupils. I only attempt to provide the conditions in which they can learn.