Oddly enough, it was a Buddhist teaching that best explains my Christian faith:
“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.”--attributed to Siddhãrtha Gautama (Buddha):
I have always loved that quote. Unfortunately, its a fake. It's first appearance was in a book from the 1950's. This is the actual quote from the Suttas:
“Now, Kalamas, don’t go by reports, by legends, by traditions, by scripture, by logical conjecture, by inference, by analogies, by agreement through pondering views, by probability, or by the thought, ‘This contemplative is our teacher.’ When you know for yourselves that, ‘These qualities are skillful; these qualities are blameless; these qualities are praised by the wise; these qualities, when adopted & carried out, lead to welfare & to happiness’ — then you should enter & remain in them.”
It is slightly different, but I think the most important aspect is the same. You have to be true to what you think is right, not simply accept what you are told.