There is no place in a fanatic's head where reason can enter.

Reason is the cause of our falsification of the evidence of the senses. In so far as the senses show becoming, passing away, change, they do not lie.

Do not believe in anything simply because you have heard it. Do not believe in anything simply because it is spoken and rumored by many. Do not believe in anything simply because it is found written in your religious books. Do not believe in anything merely on the authority of your teachers and elders. Do not believe in traditions because they have been handed down for many generations. But after observation and analysis, when you find that anything agrees with reason and is conducive to the good and benefit of one and all, then accept it and live up to it.

This freedom and heavenly cheer I have placed over all things like an azure bell when I taught that over them and through them no 'eternal will' wills. This prankish folly I have put in the place of that will when I taught: In everything one thing is impossible: rationality.

For nothing is more democratic than logic; it is no respecter of persons and makes no distinction between crooked and straight noses.

Fanatics are picturesque, mankind would rather see gestures than listen to reasons.