Those who cannot change their minds cannot change anything.

I tell you that as long as I can conceive something better than myself I cannot be easy unless I am striving to bring it in to existence or clearing the way for it.

The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself.

We first make our habits, then our habits make us.

The measure of intelligence is the ability to change.

Though all society is founded on intolerance, all improvement is founded on tolerance