Karl Popper’s Paradox of Intolerance states: “if a society is tolerant without limit, their ability to be tolerant will eventually be seized or destroyed by the intolerant.”

Karl Popper's Paradox of Intolerance states: "if a society is tolerant without limit, their ability to be tolerant will eventually be seized or destroyed by the intolerant."

So he came to the conclusion that: "in order to maintain a tolerant society, the society must be intolerant of intolerance."