People don't use their eyes. They never see a bird, they see a sparrow. They never see a tree, they see a birch. They see concepts.

It is sometimes said that toleration should be refused to the intolerant. In practice this would destroy it... The only remedy for dogmatism and lies is toleration and the greatest possible liberty of expression.

It is the tragedy of the world that no one knows what he doesn't know - and the less a man knows, the more sure he is that he knows everything.

The fear of hell, the punishment of sin, how the modern parent revolts from such teaching. Yet I will assert that far from doing us children harm, it was a sure foundation to the world of our confidence, a master girder in our palace of delight.

No one can estimate the power of authority among poor and uneducated people in a world whose problems confuse even the wisest.

Sara could commit adultery at one end and weep for her sins at the other, and enjoy both operations at once.

Politics is like navigation in a sea without charts, and wise men live the lives of pilgrims.