There have been poverty, pestilence, and famine, which were due to man's inadequate mastery of nature. There have been wars, oppressions and tortures which have been due to men's hostility to their fellow men.

The Ten Commandments should be headed like an examination paper: No more than six to be attempted.

Love is something far more than desire for sexual intercourse; it is the principal means of escape from the loneliness which afflicts most men and women throughout the greater part of their lives.

When there are rational grounds for an opinion, people are content to set them forth and wait for them to operate. In such cases, people do not hold their opinions with passion; they hold them calmly, and set forth their reasons quietly. The opinions that are held with passion are always those for which no good ground exists; indeed the passion is the measure of the holder's lack of rational conviction.

We know very little, and yet it is astonishing that we know so much, and still more astonishing that so little knowledge can give us so much power.

In considering irregular appearances, there are certain very natural mistakes which must be avoided.

Everything is vague to a degree you do not realize till you have tried to make it precise.