Incomplete Commentary on Matthew (Opus imperfectum)

As Thomas Aquinas was approaching Paris, a fellow traveler pointed out the lovely buildings gracing that city. Aquinas was impressed, to be sure, but he sighed and stated that he would rather have the complete Incomplete Commentary on Matthew than to be mayor of Paris itself.

Thomas's affection for the work attests its great popularity during the Middle Ages, despite its significant missing parts—eve...