The tree of liberty must be ...

The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.
The tree of liberty must be refreshed from time to time with the blood of patriots and tyrants.

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

I hope we shall crush in its birth the aristocracy of our monied corporations which dare already to challenge our government to a trial by strength, and bid defiance to the laws of our country.
Don't talk about what you have done or what you are going to do.
Never put off till tomorrow what you can do today.
I never considered a difference of opinion in politics, in religion, in philosophy, as cause for withdrawing from a friend.
I'm a great believer in luck and I find the harder I work, the more I have of it.