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As long as men are free to ask what they must, free to say what they think, free to think what they will, freedom can never be lost and science can never regress.

The ancestor of every action is a thought.

I will not attack your doctrines nor your creeds if they accord liberty to me. If they hold thought to be dangerous – if they aver that doubt is a crime, then I attack them one and all, because they enslave the minds of men.

All our words are but crumbs that fall down from the feast of the mind.

Through space the universe encompasses and swallows me up like an atom; through thought I comprehend the world.

Action is no less necessary than thought to the instinctive tendencies of the human frame.

If we are not ashamed to think it, we should not be ashamed to say it.

The mind is everything. What you think, you become.

The mathematician has reached the highest rung on the ladder of human thought.

In sum, thought and reflection have been rendered thoroughly pointless by the circumstances in which modern men and women live and act.