Only a few years ago there was a great awakening of the human mind. Men began to inquire by what right a crowned robber made them work for him? The man who asked this question was called a traitor. Others asked by what right does a robed hypocrite rule my thought? Such men were called infidels. The priest said, and the king said, where is this spirit of investigation to stop? They said then and they say now, that it is dangerous for man to be free. I deny it. Out on the intellectual sea there is room enough for every sail. In the intellectual air there is space enough for every wing. The man who does not do his own thinking is a slave, and is a traitor to himself and to his fellow-men.

Nothing has been left undone by the enemies of freedom. Every art and artifice, every cruelty and outrage has been practiced and perpetrated to destroy the rig…

Standing in the presence of the Unknown, all have the same right to think, and all are equally interested in the great questions of origin and destiny. All I c…

There is no slavery but ignorance. Liberty is the child of intelligence. The history of man is simply the history of slavery, of injustice and brutality, toget…

Think for yourself and question authority.

'All things are to be examined and called into question. There are no limits set to thought.'

Surely it is more interesting to argue about what the truth is, than about what some particular thinker, however great, did or did not think.