Internal search of ourselves can be deceptive because of our indwelling beliefs. We conjecture and interpret our world based on what we apprehend to be the truth.
Our brain does not like the threat of having its beliefs conflicted. If you believe that vegan diet is the only best way of eating, no one needs to convince you otherwise, because you will desperately maintain your ultimate rightness.
Be skeptical about your own belief. You may believe something that is erroneous for too long.
