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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.