The medieval Islamic philosopher Al-Ghazali drew a distinction that most knowledge workers stumble over: there is *taqlīd* — inherited belief, ideas you hold because you absorbed them from competent people — and *yaqīn*, genuine certainty that survives your own rigorous interrogation. He wasn't being elitist. He was describing a structural problem: taqlīd models feel indistinguishable from real ones until the terrain changes. The danger isn't that inherited mental models are wrong. It's that they carry no memory of how they were acquired, so you can't locate the seam where your thinking ends and someone else's begins. Practically: the mental models most worth auditing today are the ones you could defend fluently but cannot trace back to a specific experience that earned them.

Which mental model you currently use most — in work or in life — could you honestly say you tested yourself, versus received from someone credible and never re-examined?

Drawing from Sufi Islamic Philosophy (Al-Ghazali) — Al-Ghazali — Iḥyāʾ ʿUlūm al-Dīn / The Revival of the Religious Sciences (c. 1107 CE)