When a pastor has been afraid to assert what is right, has he not turned his back and fled by remaining silent? Whereas if he intervenes on behalf of the flock, he sets up a wall against the enemy in front of the house of Israel.

Therefore, the Lord again says to his unfaithful people: Your prophets saw false and foolish visions and did not point out your wickedness, that you might repent of your sins.

The name of the prophet is sometimes given in the sacred writings to teachers who both declare the present to be fleeting and reveal what is to come. The word of God accuses them of seeing false visions because they are afraid to reproach men for their faults and thereby lull the evildoer with an empty promise of safety. Because they fear reproach, they keep silent and fail to point out the sinner’s wrongdoing.
--Pope St. Gregory the Great