Do not believe in anything

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.

-- Sayagyi U Ba Khin