Do not feel certain of anything.

The time has come, or is about to come, when only large-scale civil disobedience, which should be nonviolent, can save the populations from the universal death which their governments are preparing for them.

To a mind of sufficient intellectual power, the whole of mathematics would appear trivial, as trivial as the statement that a four-footed animal is an animal.

Philosophy is to be studied, not for the sake of any definite answers to its questions, since no definite answers can, as a rule, be known to be true, but rather for the sake of the questions themselves; because these questions enlarge our conception of what is possible, enrich our intellectual imagination and diminish the dogmatic assurance which closes the mind against speculation; but above all because, through the greatness of the universe which philosophy contemplates, the mind is also rendered great, and becomes capable of that union with the universe which constitutes its highest good.

The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd; indeed in view of the silliness of the majority of mankind, a widely spread belief is more likely to be foolish than sensible.

There was, I think, never any reason to believe in any innate superiority of the male, except his superior muscle.

To like many people spontaneously and without effort is perhaps the greatest of all sources of personal happiness.