Declaring our uncertainty in our beliefs to others makes us more credible communicators. We assume that if we don’t come off as 100% confident, others will value our opinions less. The opposite is usually true. If one person expresses a belief as absolutely true, and someone else expresses a belief by saying, “I believe this to be true, and I’m 80% on it,” who are you more likely to believe? The fact that the person is expressing their confidence as less than 100% signals that they are trying to get at the truth, that they have considered the quantity and quality of their information with
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