Freedom of mind is the real freedom. A person whose mind is not free though he may not be in chains, is a slave, not a free man. One whose mind is not free, though he may not be in prison, is a prisoner and not a free man. One whose mind is not free though alive, is no better than dead. Freedom of mind is the proof of one's existence.

Freedom is a state of mind.
Power is a function of the will.
Free minds radiate power.

A really free mind is scarcely attached to its opinions. If the mind cannot help giving birth to … emotions and affections which at first appear to be inseparable from them, it reacts against these intimate phenomena it experiences against its will.

When the mind is free, everything around it is free.

I call that mind free, which masters the senses, which protects itself against animal appetites, which contemns pleasure and pain in comparison to its own energy, which penetrates beneath the body and recognises its own reality and greatness, which passes life, not in asking what it shall eat or drink, but in hungering, thirsting, and seeking after righteousness.
I call that mind free, which escapes the bondage of matter, which, instead of stopping at the material universe and making it a prison wall, passes beyond it to its Author, and finds in the radiant signatures which everywhere bears of the Infinite Spirit, helps to its own spiritual enlightenment. I call that mind free, which jealously guards its intellectual rights and powers, which calls no man master, which does not content itself with a passive or hereditary faith, which opens itself to light whencesoever it may come, which receives new truth as an angel from heaven.
I call that mind free, which sets no bounds to its love, which is not imprisoned in itself or in a sect, which recognises in all human beings the image of God and the rights of his children, which delights in virtue and sympathizes with suffering wherever they are seen, which conquers pride, anger, and sloth, and offers itself up a willing victim to the cause of mankind.

There is nothing that threatens a corrupt system more than a free mind.

Nothing threatens a corrupt system like a free mind.

Nothing threatens a corrupt system more than a free mind.

I call that mind free, which jealously guards its intellectual rights and powers, which calls no man master, which does not content itself with a passive or hereditary faith, which opens itself to light whencesoever it may come.

I have learned from the difficult exigencies of life that freedom is a philosophical state of mind and existence. The mind is the only place where I can exist and feel free. In my mind, I am absolutely free.

It is doubtful, too, whether we can achieve free minds by concentrating our efforts on making our pupils economically independent. We want free minds which will seek the goods in their order. Those who seek primarily their private economic interests may become enslaved to them and try to enslave the rest of us as well.

And this I believe: that the free, exploring mind of the individual human is the most valuable thing in the world. And this I would fight for: the freedom of the mind to take any direction it wishes, undirected.

If we value the pursuit of knowledge, we must be free to follow wherever that search may lead us. The free mind is not a barking dog, to be tethered on a ten-foot chain.

A positive mind is like a powerful stream of water that is gathering volume and force from hundreds of tributaries all along its course. The further on it goes the greater its power, until when it reaches its goal, that power is simply immense. A negative mind, however, would be something like a stream, that the further it flows the more divisions it makes, until, when it reaches its goal, instead of being one powerful stream, it has become a hundred, small, weak, shallow streams.