Believe those who are seeking the truth and doubt those who find it.
We human beings are prone to believe things that play to our prejudice as likely true or absolutely true even if there is no evidence at all to support it. This is how myths began. This is how magic got its start.
If the purported truth is counterintuitive or goes against our prejudice, we scrutinize it closely and unless the evidence is overwhelming, we refuse to believe it.
Therefore the search for truth is not merely a rearrangement of our prejudices. It is an examination of evidence in spite of our prejudice and requires an open mind. You can only seek truth if you’re unafraid of what you find.
Though I am not Buddhist, considering what Buddha taught (paraphrased into English) is useful in this discussion. “Believe nothing just because a so-called wise person said it. Believe nothing just because a belief is generally held. Believe nothing just because it is said in ancient books. Believe nothing just because it’s said to be of divine origin. Believe nothing just because somebody else believes it. Believe only what you yourself test and judge to be true.”