وللمشهورات شبه بالأوليات، وتجريد الذهن وتدقيق النظر يفرق بينهما.
Commonly accepted propositions resemble first principles, but abstraction and careful scrutiny distinguish them.
A primary self-evident proposition is acknowledged by the intellect on grasping its terms, without inferential mediation. A commonly accepted proposition gains its standing from public or group acceptance; it need not be self-evident.
Feeling that a claim is “obvious” is insufficient. Is it evident through rational understanding, or merely familiar through upbringing and social repetition?