Don't believe anything. Regard things on a scale of probabilities.
The things that seem most absurd, put under 'Low Probability', and
the things that seem most plausible, you put under 'High
Probability'. Never believe anything. Once you believe anything, you
stop thinking about it. The more things you believe, the less mental
activity. If you believe something, and have an opinion on every
subject, then your brain activity stops entirely, which is clinically
considered a sign of death, nowadays in medical practice. So put
things on a scale or probability, and never believe or disbelieve
anything entirely.

-Robert A. Wilson (interview with "innerview")