Most of the greatest evils that man has inflicted upon man have come through people feeling quite certain about something which, in fact, was false.

There is much pleasure to be gained from useless knowledge.

The people who are regarded as moral luminaries are those who forego ordinary pleasures themselves and find compensation in interfering with the pleasures of others.

It is possible that mankind is on the threshold of a golden age; but, if so, it will be necessary first to slay the dragon that guards the door, and this dragon is religion.

Religion is something left over from the infancy of our intelligence, it will fade away as we adopt reason and science as our guidelines.

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.

Marriage is for women the commonest mode of livelihood, and the total amount of undesired sex endured by women is probably greater in marriage than in prostitution.

War does not determine who is right - only who is left.

The whole problem with the world is that fools and fanatics are always so certain of themselves, but wiser people so full of doubts.

I would never die for my beliefs because I might be wrong.