The Buddha

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.

The thought manifests as the word; The word manifests as the deed; The deed develops into habit; And habit hardens into character. So watch the thought and its ways with care, And let it spring from love Born out of concern for all beings.

- The Buddha