When a medieval Islamic scholar and a modern memory researcher independently arrive at the same warning, it's worth paying attention. Al-Biruni, the 11th-century polymath, observed that experts in any domain develop a kind of perceptual narrowing — they stop noticing what doesn't fit their existing framework, not from laziness, but from the very fluency that makes them competent. Cognitive scientist Ulric Neisser called this 'inattentional blindness' at the perceptual level, but the leadership problem runs deeper: the longer you've been good at something, the less you see what your competence is costing you. The practice, then, is not to second-guess yourself constantly, but to deliberately seek out someone who finds your situation confusing — their confusion is data about what you've stopped seeing.

Who in your life regularly misunderstands something you consider obvious — and when did you last treat that misunderstanding as useful information rather than a gap to correct?

Drawing from Islamic Epistemology combined with Cognitive Psychology — Al-Biruni (Kitab al-Tafhim, c. 1029) and Ulric Neisser (Cognition and Reality, 1976)