Nothing is more dangerous than an idea, when a man has only one idea. --Alain Propos sur la religion

He was a wise man who originated the idea of God. --Euripides

What makes men of genius, or rather, what they make, is not new ideas, it is that idea --possessing them --that what has been said has still not been said enough. --Eugene Delacroix

Serious people have few ideas. People with ideas are never serious. --Paul Valery

The wise only possess ideas… the greater part of mankind are possessed by them. --Samuel Taylor Coleridge

The best way to have a good idea is to have lots of ideas. --Linus Pauling

An invasion of armies can be resisted, but not an idea whose time has come. --Victor Hugo

Don't worry about people stealing an idea. If it's original, you will have to ram it down their throats. --Howard Aiken

The people who oppose your ideas are inevitably those who represent the established order that your ideas will upset. --Anthony D'Angelo