Christopher Tollefsen in his spring lecture at CU-Boulder noted this bit of scholastic humor from St. Thomas Aquinas' Summa Theologiae I.i.1 Art. 8:
If [sacred doctrine] is argued from authority, it seems unbefitting its dignity, for the proof from authority is the weakest form of proof... according to Boethius.
Curiously, New Advent's edition of the Summa omits this geeky self-parodying joke. The jest is in the Latin text, however:
Si [argumentatur] ex auctoritate, non videtur hoc congruere eius dignitati, nam locus ab auctoritate est infirmissimus, secundum Boetium.