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