(4) Every valley shall be exalted.--The figure is drawn from the titanic engineering operations of the kingly road-makers of the East, but the parable is hardly veiled. The meek exalted, the proud brought low, wrong ways set right, rough natures smoothed: that is the true preparation for the coming of the Lord, and therefore the true work of every follower of the Baptist in preparing the way. (Comp. Matthew 3:5-7; Luke 3:3-9.)

Verse 4. - Every valley shall be exalted, etc.; rather, let every valley be exalted. The prophets are to see that the poor and lowly are raised up; the proud and self-righteous depressed; the crooked and dishonest induced to change their ways for those of simplicity and integrity; the rude, rough, and harsh rendered courteous and mild. "In general, the meaning is that Israel is to [be made] take care that the God who is coming to deliver it shall find it in such an inward and outward state as befits his... purpose" (Delitzsch, 'Comment. on Isaiah,' vol. 2. p. 142).

40:1-11 All human life is a warfare; the Christian life is the most so; but the struggle will not last always. Troubles are removed in love, when sin is pardoned. In the great atonement of the death of Christ, the mercy of God is exercised to the glory of his justice. In Christ, and his sufferings, true penitents receive of the Lord's hand double for all their sins; for the satisfaction Christ made by his death was of infinite value. The prophet had some reference to the return of the Jews from Babylon. But this is a small event, compared with that pointed out by the Holy Ghost in the New Testament, when John the Baptist proclaimed the approach of Christ. When eastern princes marched through desert countries, ways were prepared for them, and hinderances removed. And may the Lord prepare our hearts by the teaching of his word and the convictions of his Spirit, that high and proud thoughts may be brought down, good desires planted, crooked and rugged tempers made straight and softened, and every hinderance removed, that we may be ready for his will on earth, and prepared for his heavenly kingdom. What are all that belongs to fallen man, or all that he does, but as the grass and the flower thereof! And what will all the titles and possessions of a dying sinner avail, when they leave him under condemnation! The word of the Lord can do that for us, which all flesh cannot. The glad tidings of the coming of Christ were to be sent forth to the ends of the earth. Satan is the strong man armed; but our Lord Jesus is stronger; and he shall proceed, and do all that he purposes. Christ is the good Shepherd; he shows tender care for young converts, weak believers, and those of a sorrowful spirit. By his word he requires no more service, and by his providence he inflicts no more trouble, than he will strengthen them for. May we know our Shepherd's voice, and follow him, proving ourselves his sheep.Every valley shall be exalted, and every mountain and hill shall be made low,.... Which is not to be understood literally, but, as Kimchi says, parabolically and mystically: the meaning is, that in consequence of John's ministry, and our Lord's coming, such who were depressed and bowed down with the guilt of sin, and were low and humble in their own eyes, should be raised up and comforted; and that such who were elated with themselves, and their own righteousness, should be humbled; their pride and haughtiness should be brought down, and they treated with neglect and contempt, while great notice was taken of lowly minded ones; see Luke 14:11 and Luke 18:14,

and the crooked shall be straight and the rough places plain; what before was dark and intricate in prophecy should now become clear; and such doctrines as were not so well understood should now become plain and easy.