A problem defined, is a problem half solved.
Most people say that it is the intellect which makes a great scientist. They are wrong: it is character.
A person who never made a mistake never tried anything new.
Insofar as we may at all claim that slavery has been abolished today, we owe its abolition to the practical consequences of science
Cherish the questions, for the answers keep changing.
I am also convinced that one gains the purest joy from spirited things only when they are not tied in with earning one's livelihood.