Many a marriage hardly differs from prostitution, except being harder to escape from.

Right conduct can never, except by some rare accident, be promoted by ignorance or hindered by knowledge.

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

When conscious activity is wholly concentrated on some one definite purpose, the ultimate result, for most people, is lack of balance accompanied by some form of nervous disorder.

Really high-minded people are indifferent to happiness, especially other people's.

Men fear thought as they fear nothing else on earth - more than ruin, more even than death. Thought is subversive and revolutionary, destructive and terrible, thought is merciless to privilege, established institutions, and comfortable habits; thought is anarchic and lawless, indifferent to authority, careless of the well-tried wisdom of the ages. Thought looks into the pit of hell and is not afraid ... Thought is great and swift and free, the light of the world, and the chief glory of man.

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.