Bede

Just as vinegar to the teeth, etc. Just as the treachery of heretics generates trouble and tears for good teachers, so a Catholic living badly is a burden through laziness to those who have been commanded to show their faith through works. For the eyes and teeth are the preachers of the holy Church, who are accustomed to foresee right ways for her and to supply spiritual nourishment. …

Commentary on Proverbs ↗