Progress is impossible without change, and those who cannot change their minds cannot change anything.
Everybody's Political What's What? (1944)
The people who get on in this world are the people who get up and look for the circumstances they want, and, if they can't find them, make them.
Mrs. Warren's Profession (1893), Act II
You see things; and you say 'Why?' But I dream things that never were; and I say 'Why not?'
Back to Methuselah (1921), Part I, Act I, spoken by the Serpent
The reasonable man adapts himself to the world: the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
Man and Superman (1903), Maxims for Revolutionists
This is the true joy in life, the being used for a purpose recognized by yourself as a mighty one.
Man and Superman (1903), Epistle Dedicatory