1. He tells them upon what grounds they might be secure. He does not disturb their false confidences, till he has first shown them a firm bottom on which they may repose themselves (v. 16): Behold, I lay in Zion for a foundation a stone. This foundation is, (1.) The promises of God in general—his word, upon which he has caused his people to hope—his covenant with Abraham, that he would be a God to him and his; this is a foundation, a foundation of stone, firm and lasting, for faith to build upon; it is a tried stone, for all the saints have stayed themselves upon it and it never failed them. (2.) The promise of Christ in particular; for to him this is expressly applied in the New Testament, 1 Pet. ii. 6-8. He is that stone which has become the head of the corner. The great promise of the Messiah and his kingdom, which was to begin at Jerusalem, was sufficient to make God's people easy in the worst of times; for they knew well that till he came the sceptre should not depart from Judah. Zion shall continue while this foundation is yet to be laid there. "Thus saith the Lord Jehovah, for the comfort of those that dare not make lies their refuge, Behold, and look upon me as one that has undertaken to lay in Zion a Stone," Jesus Christ is a foundation of God's laying. This is the Lord's doing. He is laid in Zion, in the church, in the holy hill. He is a tried stone, a trying stone (so some), a touch-stone, that shall distinguish between true and counterfeit. He is a precious stone, for such are the foundations of the New Jerusalem (Rev. xxi. 19), a corner-stone, in whom the sides of the building are united, the head-stone of the corner. And he that believes these promises, and rests upon them, shall not make haste, shall not run to and fro in a hurry, as men at their wits' end, shall not be shifting hither and thither for his own safety, nor be driven to his feet by any terrors, as the wicked man is said to be (Job xviii. 11), but with a fixed heart shall quietly wait the event, saying, Welcome the will of God. He shall not make haste in his expectations, so as to anticipate the time set in the divine counsels, but, though it tarry, will wait the appointed hour, knowing that he that shall come will come, and will not tarry. He that believes will not make more haste than good speed, but be satisfied that God's time is the best time, and wait with patience for it. The apostle from the LXX. explains this, 1 Pet. ii. 6. He that believes on him shall not be confounded; his expectations shall not be frustrated, but far out-done.