"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."
"There are two motives for reading a book; one, that you enjoy it; the other, that you can boast about it."
"To fear love is to fear life, and those who fear life are already 3-parts dead."
"To like many people spontaneously and without effort is perhaps the greatest of all sources of personal happiness."
"What is wanted is not the will to believe, but the will to find out, which is the exact opposite."
"Never let yourself be diverted, either by what you wish to believe, or what you think could have beneficent social effects if it were believed; but look only and solely at what are the facts."