Only remember that the eye of faith alone can see that guard, and that therefore we must labour to keep our consciousness of its reality fresh and vivid. Many a man in David's little band saw nothing but cold gray stone where David saw the flashing armour of the heavenly Warrior. To the one all the mountain blazed with fiery chariots, to the other it was a lone hillside, with the wind moaning among the rocks. We shall lose the joy and the strength of that divine protection unless we honestly and constantly try to keep our sense of it bright. Eyes that have been gazing on earthly joys, or perhaps gloating on evil sights, cannot see the Angel presence. A Christian man, on a road which he cannot travel with a clear conscience, will see no angel, not even the Angel with the drawn sword in His hand, that barred Balaam's path among the vineyards. A man coming out of some room blazing with light cannot all at once see into the violet depths of the mighty heavens, that lie above him with all their shimmering stars. So this truth of our text is a truth of faith, and the believing eye alone beholds the Angel of the Lord. Notice, too, that final word of deliverance. This psalm is continually recurring to that idea. The word occurs four times in it, and the thought still oftener. Whether the date is rightly given, as we have assumed it to be, or not, at all events that harping upon this one phrase indicates that some season of great trial was its birth-time, when all the writer's thoughts were engrossed and his prayers summed up in the one thing--deliverance. He is quite sure that such deliverance must follow if the Angel presence be there. But he knows too that the encampment of the Angel of the Lord will not keep away sorrows, and trial, and sharp need. So his highest hope is not of immunity from these, but of rescue out of them. And his ground of hope is that his heavenly Ally cannot let him be overcome. That He will let him be troubled and put in peril he has found; that He will not let him be crushed he believes. Shadowed and modest hopes are the brightest we can venture to cherish. The protection which we have is protection in, and not protection from, strife and danger. It is a filter which lets the icy cold water of sorrow drop numbing upon us, but keeps back the poison that was in it. We have to fight, but He will fight with us; to sorrow, but not alone nor without hope; to pass through many a peril, but we shall get through them. Deliverance, which implies danger, need, and woe, is the best we can hope for.