Sufi teachers in the classical tradition made a distinction that product managers almost never make: the difference between *'ilm al-yaqīn* — knowledge by description — and *'ayn al-yaqīn* — knowledge by direct sight. Al-Ghazali, writing in the *Ihyā' 'Ulūm al-Dīn* in the 11th century, used this to argue that a man who has read every book about fire and a man who has burned his hand are not in possession of the same knowledge. They agree on the facts. They do not agree on the thing. Product managers spend most of their careers in the first kind of knowing — analytics dashboards, user research summaries, NPS scores, synthesized insights. All of it is *'ilm al-yaqīn*: accurate, shareable, and structurally blind to what it cannot represent. The burn is the data point that doesn't survive translation into a slide. The discipline Al-Ghazali pointed toward isn't ethnography for its own sake — it's periodically insisting that someone on the team has *actually experienced the problem*, not reviewed the report about it. Before the next prioritization meeting, ask whose knowledge in the room is descriptive and whose is direct. That asymmetry is usually the real explanation for why certain debates never resolve.

Who in your last prioritization discussion had direct, first-hand experience of the problem being debated — and how much did that voice actually shape the outcome compared to the people holding the data summaries?

Drawing from Sufi epistemology / Islamic philosophy — Al-Ghazali (Ihyā' 'Ulūm al-Dīn, c. 1090 CE)