The ability to understand a question from all sides meant one was totally unfit for action. Fanatical enthusiasm was the mark of the real man. - Thucydides
The pursuit of knowledge for its own sake, an almost fanatical love of justice, and the desire for personal independence - these are the features of Jewish tradition that make me thank my stars that I belong to it. - Albert Einstein
The opposite of the religious fanatic is not the fanatical atheist but the gentle cynic who cares not whether there is a god or not. - Eric Hoffer
A strange fanaticism fills our time: the fanatical hatred of morality, especially of Christian morality. - G.K. Chesterton