Pastors who maintain good relationships with their congregations bite their tongues with great regularity. Avoid the temptation to say, "If you had attended the last board meeting/worship service/committee meeting as you were supposed to, you would have known that!"
Or, "Since you know so much about the topic, why don't you preach a sermon series on it." As good as it might feel to make those comments, the pastor pays too high a price in terms of guilt, escalating conflict, and damage to relationships.
R. Robert Cueni, What Ministers Can't Learn in Seminary