I once saw this at a Benedictine monastery I visited:
And I thought it made a perfect comments policy. The text says:
“If any pilgrim monk come from distant parts, if with wish as a guest to dwell in the monastery, and will be content with the customs which he find in the place, do not perchance by his lavishness disturb the monastery, but is simply content with what he finds, he shall be received, for as long a time as he desires. If, indeed, he find fault with anything, or expose it, reasonably, and with the humility of charity, the Abbot shall discuss it prudently, lest perchance God had sent him for this very thing. But, if he have been found gossipy and contumacious in the time of his sojourn as guest, not only ought he not to be joined to the body of the monastery, but also it shall be said to him, honestly, that he must depart. If he does not go, let two stout monks, in the name of God, explain the matter to him.”
Just make the following replacements in the text, and you’ll know my comments policy!
Monk = Commenter
Lavishness = Rudeness, Obscenity, etc.
Monastery = Combox
Abbot = Blog Owner (Me)
Two Stout Monks: The “Delete Comment” and “Ban Commenter” options in my control panel
Note: St. Benedict probably did not write that himself, though it is commonly attributed to him.