Bede, on Prov 25:28

“As a city that lieth open and is not compassed with walls, so is a man that cannot refrain his own spirit in speaking.”

“"As a city broken down and without walls," etc. For if it does not have the wall of silence, the city of the mind lies open to the darts of the enemy. And as it casts itself outside through words, it exposes itself openly to the adversary; which he overcomes without effort, as much as the one who is conquered fights against herself through much talking.”

Imported from an open dataset — not yet checked against the printed edition.