Books won't stay banned. They ...

Books won\'t stay banned. They won\'t burn. Ideas won\'t go to jail.
Books won't stay banned. They won't burn. Ideas won't go to jail.
 Alfred Whitney Griswold

More phrases

All the great things are simple, and many can be expressed in a single word: freedom, justice, honor, duty, mercy, hope.
I know but one freedom and that is the freedom of the mind.
 Antoine de Saint-Exupéry
Freedom is not worth having if it does not connote freedom to err.
The amount of happiness that you have depends on the amount of freedom you have in your heart.
 Thích Nhất Hạnh
Without freedom of thought, there can be no such thing as wisdom - and no such thing as public liberty without freedom of speech.

Quotes from the same author

There are certain things that we can accomplish by law and there are certain things that we cannot accomplish by law or by any process of government. We cannot legislate intelligence. We cannot legislate morality. Nor can we legislate loyalty, for loyalty is a kind of morality.
 Alfred Whitney Griswold
The liberal arts inform and enlighten the independent citizen of a democracy in the use of his own resources.... They enlarge his capacity for self-knowledge and expand his opportunities for self-improvement.... They are the wellsprings of a free society.
 Alfred Whitney Griswold