"Be not misled by reports or tradition or common opinion. Be not misled by
proficiency in the scriptures, nor by speculation and conclusions, nor by
attractive theories and favorite ideas, nor by impressions of personal merits
(of the teacher) and not by the authority of some master. But rather,
Kalamas, when you discern yourselves: these things are unprofitable, these
things are blameworthy, these things are censured by the wise; these things,
when performed and undertaken are conducive to misfortune and sorrow, indeed
do you then reject them."
"...And when you discern yourselves: these things are profitable, these things
are not blameworthy, these things are praised by the wise; these things, when
performed and undertaken are conducive to good fortune and happiness, indeed
do you then accept them."
[G. Buddha, from the Anguttara Nikaya]