Extremists think ”communication” means agreeing with them. Leo Rosten
Extreme positions are not succeeded by moderate ones, but by contrary extreme positions. Friedrich Nietzsche
What is objectionable, what is dangerous, about extremists is not that they are extreme, but that they are intolerant. The evil is not what they say about their cause, but what they say about their opponents. Robert F Kennedy
The question is not whether we will be extremists, but what kind of extremists we will be. Martin Luther King, Jr
No violent extreme endures. Thomas Carlyle
Every extreme attitude is a flight from the self. Eric Hoffer
I would remind you that extremism in the defense of liberty is no vice! And let me remind you also that moderation in the pursuit of justice is no virtue. Barry Goldwater