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Follow the path of the unsafe, independent thinker. Expose your ideas to the dangers of controversy. Speak your mind and fear less the label of 'crackpot' than the stigma of conformity. And on issues that seem important to you, stand up and be counted at any cost.

Open debate is our strongest tool in standing up to extremism. The far more dangerous avenue is to force extremist ideas underground, where they can fester without competition.

The clash of ideas is the sound of freedom.

By not caring too much about what people think, I'm able to think for myself and propagate ideas which are very often unpopular. And I succeed.

I've always been interested in people who think out of their time, and I have this passion, actually, for science. I'm just so enormously interested in how, when you think of these revolutionary ideas, other people get threatened, especially if you are different.

Do not be afraid to offer ideas that draw opposition. Remember, if no one is against your idea, then your idea probably doesn't do anything.

There are two things which cannot be attacked in front: ignorance and narrow-mindedness. They can only be shaken by the simple development of the contrary qualities. They will not bear discussion.

If you are going to make a change, don't go halfway. Make it with conviction and stick with your new idea. Ignore the scoffers. Remember, it is a law of nature that if something is different you're going to be taunted, jeered, and told the world is flat. Let the doubters fall off the edge.

Ideas govern the world, or throw it into chaos.

Have an open mind - allow different ideas into your way of thinking.