Every step by which men add to their knowledge and skills is a step also by which they can control other men.

The problem of freedom in America is that of maintaining a competition of ideas, and you do not achieve that by silencing one brand of idea.

Principles-and I have in mind such principles as states' rights or national sovereignty or the free market or pacifism-have a way of drying up while the sap of life goes flowing in another direction.

I am neither an optimist nor pessimist, but a possibilist.

You may call for peace as loudly as you wish, but where there is no brotherhood there can in the end be no peace.

In the end, as any successful teacher will tell you, you can only teach the things that you are. If we practice racism then it is racism we teach.

When evil acts in the world it always manages to find instruments who believe that what they do is not evil but honorable.