There may be no good reasons for very many opinions that are held with passion.

When all experts agree, you need to watch out.

I consider the official Catholic attitude on divorce, birth control, and censorship exceedingly dangerous to mankind.

I am delighted to know that Principia Mathematica can now be done by machinery. . . I am quite willing to believe that anything in deductive logic can be done by machinery.

Worry is a form of fear, and all forms of fear produce fatigue. A man who has learned not to feel fear will find the fatigue of daily life enormously diminished.

Next to worry probably one of the most potent causes of unhappiness is envy.

Even if it is indifferent to human desires, as it seems to be; if human life is a passing episode, hardly noticeable in the vastness of cosmic processes; if there is no superhuman purpose, and no hope of ultimate salvation, it is better to know and acknowledge this truth than to endeavor, in futile self-assertion, to order the universe to be what we find comfortable.