Others indeed may talk, and ...

Others indeed may talk, and write, and fight about liberty, and make an outward pretence to it but the free-thinker alone is truly free.
Others indeed may talk, and write, and fight about liberty, and make an outward pretence to it but the free-thinker alone is truly free.
 George Berkeley

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

He who says there is no such thing as an honest man, you may be sure is himself a knave.
 George Berkeley
The question between the materialists and me is not, whether things have a real existence out of the mind of this or that person, but whether they have an absolute existence, distinct from being perceived by God, and exterior to all minds.
 George Berkeley
Atheism ... that bugbear of women and fools ... is the very top and perfection of free-thinking. It is the grand arcanum to which a true genius naturally riseth, by a certain climax or gradation of thought, and without which he can never possess his soul in absolute liberty and repose.
 George Berkeley
That thing of hell and eternal punishment is the most absurd, as well as the most disagreeable thought that ever entered into the head of mortal man.
 George Berkeley
The love of truth, virtue, and the happiness of mankind are specious pretexts, but not the inward principles that set divines at work; else why should they affect to abuse human reason, to disparage natural religion, to traduce the philosophers as they universally do?
 George Berkeley