Matthew Henry on Ezekiel 33:30-33

Unworthy and corrupt motives often lead men to the places where the word of God is faithfully preached. Many come to find somewhat to oppose: far more come of curiosity or mere habit. Men may have their hearts changed. But whether men hear or forbear, they will know by the event that a servant of God has been among them. All who will not know the worth of mercies by the improvement of them, will justly be made to know their worth by the want of them.