Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young. 

The whole secret of existence is to have no fear. Never fear what will become of you, depend on no one. Only the moment you reject all help are you freed.

We must, indeed, all hang together or, most assuredly, we shall all hang separately. 

God sent me on earth. He send me to do something, and nobody can stop me. If God want to stop me, then I stop. Man never can.

My heart is very weary and sad and alone, For its dreams like the fluttering leaves have gone, And why should I say behind.

You ask me if I keep a notebook to record my great ideas. I've only ever had one.

If we are not free, no one will respect us.

The environment is everything that isn't me.

Morality is the basis of things and truth is the substance of all morality.

Compromise is not such ignoble and deplorable a thing as we generally think. It is rather an indispensable factor in the political strategy. Any nation that rises against the oppressors is bound to fail in the beginning and to gain partial reforms during the medieval period of its struggle through compromises.

National interest and the interest of the people in power may be at loggerheads at times.

I object to violence because when it appears to do good, the good is only temporary; the evil it does is permanent.