Doubt was nothing more than epistemological humility: a deep and practical awareness that outside our sphere of knowledge there existed information and experiences that might show our position to be in error. Doubt causes us to hold a strong position a bit more loosely, such that an acknowledgment of ignorance or error doesn’t crush our sense of self or leave us totally unmoored if our position proves untenable. Certainty is the opposite: it hampers inquiry and hinders growth. It teaches us to ignore evidence that contradicts our ideas, and encourages us to defend our position at all costs,
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