A Commentary, Critical, Practical, and Explanatory on the Old and New Testaments, by Robert Jamieson, A.R. Fausset and David Brown  at sacred-texts.com
isa 40:1SECOND PART OF THE PROPHECIES OF ISAIAH. (Isa. 40:1-31)
Comfort ye, comfort ye--twice repeated to give double assurance. Having announced the coming captivity of the Jews in Babylon, God now desires His servants, the prophets (Isa 52:7), to comfort them. The scene is laid in Babylon; the time, near the close of the captivity; the ground of comfort is the speedy ending of the captivity, the Lord Himself being their leader.
my people . . . your God--correlatives (Jer 31:33; Hos 1:9-10). It is God's covenant relation with His people, and His "word" of promise (Isa 40:8) to their forefathers, which is the ground of His interposition in their behalf, after having for a time chastised them (Isa 54:8).
isa 40:2comfortably--literally, "to the heart"; not merely to the intellect.
Jerusalem--Jerusalem though then in ruins, regarded by God as about to be rebuilt; her people are chiefly meant, but the city is personified.
cry--publicly and emphatically as a herald cries aloud (Isa 40:3).
warfare--or, the appointed time of her misery (Job 7:1, Margin; Job 14:14; Dan 10:1). The ulterior and Messianic reference probably is the definite time when the legal economy of burdensome rites is at an end (Gal 4:3-4).
pardoned--The Hebrew expresses that her iniquity is so expiated that God now delights in restoring her.
double for all her sins--This can only, in a very restricted sense, hold good of Judah's restoration after the first captivity. For how can it be said her "warfare was accomplished," when as yet the galling yoke of Antiochus and also of Rome was before them? The "double for her sins" must refer to the twofold captivity, the Assyrian and the Roman; at the coming close of this latter dispersion, and then only, can her "iniquity" be said to be "pardoned," or fully expiated [HOUBIGANT]. It does not mean double as much as she deserved, but ample punishment in her twofold captivity. Messiah is the antitypical Israel (compare Mat 2:15, with Hos 11:1). He indeed has "received" of sufferings amply more than enough to expiate "for our sins" (Rom 5:15, Rom 5:17). Otherwise (cry unto her) "that she shall receive (blessings) of the Lord's hand double to the punishment of all her sins" (so "sin" is used, Zac 14:19, Margin) [LOWTH]. The English Version is simpler.
isa 40:3crieth in the wilderness--So the Septuagint and Mat 3:3 connect the words. The Hebrew accents, however, connect them thus: "In the wilderness prepare ye," &c., and the parallelism also requires this, "Prepare ye in the wilderness," answering to "make straight in the desert." Matthew was entitled, as under inspiration, to vary the connection, so as to bring out another sense, included in the Holy Spirit's intention; in Mat 3:1, "John the Baptist, preaching in the wilderness," answers thus to "The voice of one crying in the wilderness." MAURER takes the participle as put for the finite verb (so in Isa 40:6), "A voice crieth." The clause, "in the wilderness," alludes to Israel's passage through it from Egypt to Canaan (Psa 68:7), Jehovah being their leader; so it shall be at the coming restoration of Israel, of which the restoration from Babylon was but a type (not the full realization; for their way from it was not through the "wilderness"). Where John preached (namely, in the wilderness; the type of this earth, a moral wilderness), there were the hearers who are ordered to prepare the way of the Lord, and there was to be the coming of the Lord [BENGEL]. John, though he was immediately followed by the suffering Messiah, is rather the herald of the coming reigning Messiah, as Mal 4:5-6 ("before the great and dreadful day of the Lord"), proves. Mat 17:11 (compare Act 3:21) implies that John is not exclusively meant; and that though in one sense Elias has come, in another he is yet to come. John was the figurative Elias, coming "in the spirit and power of Elias" (Luk 1:17); Joh 1:21, where John the Baptist denies that he was the actual Elias, accords with this view. Mal 4:5-6 cannot have received its exhaustive fulfilment in John; the Jews always understood it of the literal Elijah. As there is another consummating advent of Messiah Himself, so perhaps there is to be of his forerunner Elias, who also was present at the transfiguration.
isa 40:4Eastern monarchs send heralds before them in a journey to clear away obstacles, make causeways over valleys, and level hills. So John's duty was to bring back the people to obedience to the law and to remove all self-confidence, pride in national privileges, hypocrisy, and irreligion, so that they should be ready for His coming (Mal 4:6; Luk 1:17).
isa 40:5see it--The Septuagint for "it," has "the salvation of God." So Luk 3:6 (compare Luk 2:30, that is, Messiah); but the Evangelist probably took these words from Isa 52:10.
for--rather, "All flesh shall see that the mouth of Jehovah hath spoken it" [BENGEL].
isa 40:6The voice--the same divine herald as in Isa 40:3.
he--one of those ministers or prophets (see on Isa 40:1) whose duty it was, by direction of "the voice," to "comfort the Lord's afflicted people with the promises of brighter days."
All flesh is grass--The connection is, "All human things, however goodly, are transitory: God's promises alone steadfast" (Isa 40:8, Isa 40:15, Isa 40:17, Isa 40:23-24); this contrast was already suggested in Isa 40:5, "All flesh . . . the mouth of the Lord." Pe1 1:24-25 applies this passage distinctly to the gospel word of Messiah (compare Joh 12:24; Jam 1:10).
isa 40:7spirit of the Lord--rather, "wind of Jehovah" (Psa 103:16). The withering east wind of those countries sent by Jehovah (Jon 4:8).
the people--rather, "this people" [LOWTH], which may refer to the Babylonians [ROSENMULLER]; but better, mankind in general, as in Isa 42:5, so Isa 40:6, "all flesh"; this whole race, that is, man.
isa 40:9Rather, "Oh, thou that bringest good things to Zion; thou that bringest good tidings to Jerusalem." "Thou" is thus the collective personification of the messengers who announce God's gracious purpose to Zion (see on Isa 40:1); Isa 52:7 confirms this [Vulgate and GESENIUS]. If English Version be retained, the sense will be the glad message was first to be proclaimed to Jerusalem, and then from it as the center to all "Judea, Samaria, and the uttermost parts of the earth" (Luk 24:47, Luk 24:49; Act 1:8) [VITRINGA and HENGSTENBERG].
mountain--It was customary for those who were about to promulgate any great thing, to ascend a hill from which they could be seen and heard by all (Jdg 9:7; Mat 5:1).
be not afraid--to announce to the exiles that their coming return home is attended with danger in the midst of the Babylonians. The gospel minister must "open his mouth boldly" (Pro 29:25; Eph 6:19).
Behold--especially at His second coming (Zac 12:10; Zac 14:5).
isa 40:10with strong hand--or, "against the strong"; rather, "as a strong one" [MAURER]. Or, against the strong one, namely, Satan (Mat 12:29; Rev 20:2-3, Rev 20:10) [VITRINGA].
arm--power (Psa 89:13; Psa 98:1).
for him--that is, He needs not to seek help for Himself from any external source, but by His own inherent power He gains rule for Himself (so Isa 40:14).
work--or, "recompense for his work"; rather, "recompense which He gives for work" (Isa 62:11; Rev 22:12).
isa 40:11feed--including all a shepherd's care--"tend" (Eze 34:23; Psa 23:1; Heb 13:20; Pe1 2:25).
carry--applicable to Messiah's restoration of Israel, as sheep scattered in all lands, and unable to move of themselves to their own land (Psa 80:1; Jer 23:3). As Israel was "carried from the womb" (that is, in its earliest days) (Isa 63:9, Isa 63:11-12; Psa 77:20), so it shall be in "old age" (that is, its latter days) (Isa 46:3-4).
gently lead--as a thoughtful shepherd does the ewes "giving suck" (Margin) (Gen 33:13-14).
isa 40:12Lest the Jews should suppose that He who was just before described as a "shepherd" is a mere man, He is now described as GOD.
Who--Who else but GOD could do so? Therefore, though the redemption and restoration of His people, foretold here, was a work beyond man's power, they should not doubt its fulfilment since all things are possible to Him who can accurately regulate the proportion of the waters as if He had measured them with His hand (compare Isa 40:15). But MAURER translates: "Who can measure," &c., that is, How immeasurable are the works of God? The former is a better explanation (Job 28:25; Pro 30:4).
span--the space from the end of the thumb to the end of the middle finger extended; God measures the vast heavens as one would measure a small object with his span.
dust of the earth--All the earth is to Him but as a few grains of dust contained in a small measure (literally, "the third part of a larger measure").
hills in a balance--adjusted in their right proportions and places, as exactly as if He had weighed them out.
isa 40:13Quoted in Rom 11:34; Co1 2:16. The Hebrew here for "directed" is the same as in Isa 40:12 for "meted out"; thus the sense is, "Jehovah measures out heaven with His span"; but who can measure Him? that is, Who can search out His Spirit (mind) wherewith He searches out and accurately adjusts all things? MAURER rightly takes the Hebrew in the same sense as in Isa 40:12 (so Pro 16:2; Pro 21:2), "weigh," "ponder." "Direct," as in English Version, answers, however, better to "taught" in the parallel clause.
isa 40:14path of judgment--His wisdom, whereby He so beautifully adjusts the places and proportions of all created things.
isa 40:15of--rather, (hanging) from a bucket [MAURER].
he taketh up . . . as a very little thing--rather, "are as a mere grain of dust which is taken up," namely, by the wind; literally, "one taketh up," impersonally (Exo 16:14) [MAURER].
isles--rather, "lands" in general, answering to "the nations" in the parallel clause; perhaps lands, like Mesopotamia, enclosed by rivers [JEROME] (so Isa 42:15). However, English Version, "isles" answers well to "mountains" (Isa 40:12), both alike being lifted up by the power of God; in fact, "isles" are mountains upheaved from the bed of the sea by volcanic agency; only that he seems here to have passed from unintelligent creatures (Isa 40:12) to intelligent, as nations and lands, that is, their inhabitants.
isa 40:16All Lebanon's forest would not supply fuel enough to burn sacrifices worthy of the glory of God (Isa 66:1; Kg1 8:27; Psa 50:8-13).
beasts--which abounded in Lebanon.
isa 40:17(Psa 62:9; Dan 4:35).
less than nothing--MAURER translates, as in Isa 41:24, "of nothing" (partitively; or expressive of the nature of a thing), a mere nothing.
isa 40:18Which of the heathen idols, then, is to be compared to this Almighty God? This passage, if not written (as BARNES thinks) so late as the idolatrous times of Manasseh, has at least a prospective warning reference to them and subsequent reigns; the result of the chastisement of Jewish idolatry in the Babylonish captivity was that thenceforth after the restoration the Jews never fell into it. Perhaps these prophecies here may have tended to that result (see Kg2 23:26-27).
isa 40:19graven--rather, an image in general; for it is incongruous to say "melteth" (that is, casts out of metal) a graven image (that is, one of carved wood); so Jer 10:14, "molten image."
spreadeth it over--(See on Isa 30:22).
chains--an ornament lavishly worn by rich Orientals (Isa 3:18-19), and so transferred to their idols. Egyptian relics show that idols were suspended in houses by chains.
isa 40:20impoverished--literally, "sunk" in circumstances.
no oblation--he who cannot afford to overlay his idol with gold and silver (Isa 40:19).
tree . . . not rot--the cedar, cypress, oak, or ash (Isa 44:14).
graven--of wood; not a molten one of metal.
not be moved--that shall be durable.
isa 40:21ye--who worship idols. The question emphatically implies, they had known.
from the beginning-- (Isa 41:4, Isa 41:26; Isa 48:16). God is the beginning (Rev 1:8). The tradition handed down from the very first, of the creation of all things by God at the beginning, ought to convince you of His omnipotence and of the folly of idolatry.
isa 40:22It is he--rather, connected with last verse, "Have ye not known?"--have ye not understood Him that sitteth . . .? (Isa 40:26) [MAURER].
circle--applicable to the globular form of the earth, above which, and the vault of sky around it, He sits. For "upon" translate "above."
as grasshoppers--or locusts in His sight (Num 13:33), as He looks down from on high (Psa 33:13-14; Psa 113:4-6).
curtain--referring to the awning which the Orientals draw over the open court in the center of their houses as a shelter in rain or hot weather.
isa 40:23(Psa 107:4; Dan 2:21).
judges--that is, rulers; for these exercised judicial authority (Psa 2:10). The Hebrew, shophtee, answers to the Carthaginian chief magistrates, suffetes.
isa 40:24they--the "princes and judges" (Isa 40:23) who oppose God's purposes and God's people. Often compared to tall trees (Psa 37:35; Dan 4:10).
not . . . sown--the seed, that is, race shall become extinct (Nah 1:14).
stock--not even shall any shoots spring up from the stump when the tree has been cut down: no descendants whatever (Job 14:7; see on Isa 11:1).
and . . . also--so the Septuagint. But MAURER translates, "They are hardly (literally, 'not yet', as in Kg2 20:4) planted (&c.) when He (God) blows upon them."
blow--The image is from the hot east wind (simoon) that "withers" vegetation.
whirlwind . . . stubble-- (Psa 83:13), where, "like a wheel," refers to the rotatory action of the whirlwind on the stubble.
isa 40:25(Compare Isa 40:18).
isa 40:26bringeth out . . . host--image from a general reviewing his army: He is Lord of Sabaoth, the heavenly hosts (Job 38:32).
calleth . . . by names--numerous as the stars are. God knows each in all its distinguishing characteristics--a sense which "name" often bears in Scripture; so in Gen 2:19-20, Adam, as God's vicegerent, called the beasts by name, that is, characterized them by their several qualities, which, indeed, He has imparted.
by the greatness . . . faileth--rather, "by reason of abundance of (their inner essential) force and firmness of strength, not one of them is driven astray"; referring to the sufficiency of the physical forces with which He has endowed the heavenly bodies, to prevent all disorder in their motions [HORSLEY]. In English Version the sense is, "He has endowed them with their peculiar attributes ('names') by the greatness of His might," and the power of His strength (the better rendering, instead of, "for that He is strong").
isa 40:27Since these things are so, thou hast no reason to think that thine interest ("way," that is, condition, Psa 37:5; Jer 12:1) is disregarded by God.
judgment is passed over from--rather, "My cause is neglected by my God; He passes by my case in my bondage and distress without noticing it."
my God--who especially might be expected to care for me.
isa 40:28known--by thine own observation and reading of Scripture.
heard--from tradition of the fathers.
everlasting, &c.--These attributes of Jehovah ought to inspire His afflicted people with confidence.
no searching of his understanding--therefore thy cause cannot, as thou sayest, escape His notice; though much in His ways is unsearchable, He cannot err (Job 11:7-9). He is never "faint" or "weary" with having the countless wants of His people ever before Him to attend to.
isa 40:29Not only does He "not faint" (Isa 40:28) but He gives power to them who do faint.
no might . . . increaseth strength--a seeming paradox. They "have no might" in themselves; but in Him they have strength, and He "increases" that strength (Co2 12:9).
isa 40:30young men--literally, "those selected"; men picked out on account of their youthful vigor for an enterprise.
isa 40:31mount up-- (Sa2 1:23). Rather, "They shall put forth fresh feathers as eagles" are said to renovate themselves; the parallel clause, "renew their strength," confirms this. The eagle was thought to moult and renew his feathers, and with them his strength, in old age (so the Septuagint, Vulgate, Psa 103:5). However, English Version is favored by the descending climax, mount up--run--walk; in every attitude the praying, waiting child of God is "strong in the Lord" (Psa 84:7; Mic 4:5; Heb 12:1).