"It is essential to happiness that our way of living should spring from our own deep impulses and not from the accidental tastes and desires of those who happen to be our neighbors, or even our relations."
"To like many people spontaneously and without effort is perhaps the greatest of all sources of personal happiness."
"There are two motives for reading a book; one, that you enjoy it; the other, that you can boast about it."
"Science is what you know, philosophy is what you don't know"
"The whole problem with the world is that fools and fanatics are always so certain of themselves, and wiser people so full of doubts."
"It is not what the man of science believes that distinguishes him, but how and why he believes it. His beliefs are tentative, not dogmatic; they are based on evidence, not on authority or intuition."