1. The alarm is given; let all take notice of it at their peril; God is coming in a way of mercy, and we must prepare for him, v. 3-5. If we apply it to their captivity, it may be taken as a promise that, whatever difficulties lie in their way, when they return they shall be removed. This voice in the wilderness (divine power going along with it) sets pioneers on work to level the roads. But it may be taken as a call to duty, and it is the same duty that we are called to, in preparation for Christ's entrance into our souls. (1.) We must get into such a frame of spirit as will dispose us to receive Christ and his gospel: "Prepare you the way of the Lord; prepare yourselves for him, and let all that be suppressed which would be an obstruction to his entrance. Make room for Christ: Make straight a highway for him." If he prepare the end for us, we ought surely to prepare the way for him. Prepare for the Saviour; lift up your heads, O you gates! Ps. xxiv. 7, 9. Prepare for the salvation, the great salvation, and other minor deliverances. Let us get to be fit for them, and then God will work them out. Let us not stand in our own light, nor put a bar in our own door, but find, or make, a highway for him, even in that which was desert ground. This is that for which he waits to be gracious. (2.) We must get our hearts levelled by divine grace. Those that are hindered from comfort in Christ by their dejections and despondencies are the valleys that must be exalted. Those that are hindered from comfort in Christ by a proud conceit of their own merit and worth are the mountains and hills that must be made low. Those that have entertained prejudices against the word and ways of God, that are untractable, and disposed to thwart and contradict even that which is plain and easy because it agrees not with their corrupt inclinations and secular interests, are the crooked that must be made straight and the rough places that must be made plain. Let but the gospel of Christ have a fair hearing, and it cannot fail of acceptance. This prepares the way of the Lord; and thus God will by his grace prepare his own way in all the vessels of mercy, whose hearts he opens as he did Lydia's.