Ver. 4-6. All four of the evangelists apply that prophecy, Isaiah 40:3, to John the Baptist. Luke only repeats what is Luke 3:5,6 and in Isaiah 40:4,5, and he doth but shortly repeat what is in the prophet, Luke 3:5; the prophet saith, And the glory of the Lord shall be revealed, and all flesh shall see it together: for the mouth of the Lord hath spoken it. But there is nothing more usual than for the writers in the New Testament, in their quotations out of the Old Testament, to repeat the sum of the sense, not the words strictly. For the understanding of that prophecy, we must know, that there the prophet Isaiah was sent to comfort those amongst the Jews who feared God, partly with the assurance of them that they should return from Babylon, their warfare should have an end, Cyrus should deliver them; partly with the assurance of them of a far greater deliverance, in and by the coming of the Messiah (of whom Cyrus was but a type): to this purpose the prophet sets out both Cyrus, and in that type Christ's coming, as if both were present and at hand. Kings and great princes coming (especially with armies) have usually some coming before them, as pioneers, to prepare their way, by levelling rough places, and removing whatsoever is in the way of their motions, and filling up holes and ditches, &c.; nor are they far off when once their harbingers and pioneers are arrived, or are seen coming. John is here set out as a harbinger to Christ, to prepare his way, or a pioneer, to fill up ditches, throw down hills, to make rough ways smooth, and every way to prepare the way for him: that all flesh might see the salvation of God. And as princes that have wildernesses to pass through have more need of their pioneers to prepare and smooth their ways; so the state of the Jews being now confused, as a wilderness, and corrupt above measure, John the Baptist was sent before to cry in the wilderness, &c. This I take to be the true sense of the prophecy, and that it is mighty vain to strain these metaphorical phrases, and inquire what is meant by valleys, mountains, and crooked ways; they all most certainly signify the same thing, viz. whatsoever might be a hinderance to people's receiving of Christ; and to philosophize further about them, is but to show the luxury of our wit, rather than any solidity of judgment. The whole scope of these three verses is but to show, that as kings, and princes, and governors of armies, have used to have harbingers and pioneers, or other officers, to go before them, to remove things out of the way of them and their retinue, and to prepare their way; so had Christ, and John the Baptist was the man whom the Lord pitched upon for that purpose, by his preaching to bring men to it sense of their sins, and off from their wicked courses, and to show them their need of a Saviour; that so when Christ came himself forth to preach, people might not be wholly ignorant, but in some measure prepared to receive the joyful tidings of the gospel, which he brought unto them.

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