The Kalama Sutta:
Do not believe in anything (simply) because you have heard it.
Do not believe in traditions because they have been handed down for many generations.
Do not believe in anything because it is spoken and rumoured by many.
Do not believe in anything (simply) because it is found written in your religious b...ooks.
Do not believe in anything merely on the authority of your teachers and elders
But after observation and analysis when you find that anything agrees with reason and is conductive to the good and benefit of one and all then accept it and live up to it.