1. That ministers may do their duty as watchmen. It is here spoken of as a token for good, as a step towards further mercy and an earnest of it, that, in order to what he designed for them, he would set watchmen on their walls who should never hold their peace. Note, (1.) Ministers are watchmen on the church's walls, for it is as a city besieged, whose concern it is to have sentinels on the walls, to take notice and give notice of the motions of the enemy. It is necessary that, as watchmen, they be wakeful, and faithful, and willing to endure hardness. (2.) They are concerned to stand upon their guard day and night; they must never be off their watch as long as those for whose souls they watch are not out of danger. (3.) They must never hold their peace; they must take all opportunities to give warning to sinners, in season, out of season, and must never betray the cause of Christ by a treacherous or cowardly silence. They must never hold their peace at the throne of grace; they must pray, and not faint, as Moses lifted up his hands and kept them steady, till Israel had obtained the victory over Amalek, Exod. xvii. 10, 12.