I have blotted out, as a cloud, thy iniquities. The Lord promises to his people future deliverance; for our hearts cannot be actually raised towards God, if we do not perceive that he is reconciled to us. In order, therefore, that he may keep the people whom he hath once bound to himself, he adds a promise by which he comforts them, that they may be fully convinced that the banishment shall not be perpetual; for God, being a most indulgent Father, moderates his chastisements in such a manner, that he always forgives his children. When he says that "he has blotted out their iniquities," this relates literally to the captives who were punished for their transgressions; and the consequence was, that, when God was appeased, they would be delivered. It is a demonstration from the cause to the effect. The guilt has been remitted, and therefore in like manner the punishment has been remitted; for the Jews, as soon as they have been reconciled to God, are freed from the punishment which was inflicted on account of guilt. Yet there is an implied exhortation to repentance, that they may not only groan under the heavy load of chastisement, but may consider that they are justly punished, because they have provoked God's anger; and indeed, whenever God deals severely with us, we ought not merely to wish relief from uneasiness and pain, but we ought to begin with pardon, that God may no longer impute sins to us. Yet this passage overthrows the distinction of the Sophists, who acknowledge that guilt is remitted, but deny that punishment is remitted, as we have already explained fully in other passages. The metaphor of "a cloud" has the same meaning as if the Lord had said that he will no longer pursue them in his displeasure, [1] or punish them, because, when guilt has been remitted, they are reconciled; in the same manner as when the sky has become calm, the clouds which intercepted from the earth the light of the sun, are "blotted out" and disappear. We must therefore reject the diabolical inventions of men, which overthrow the whole doctrine of the forgiveness of sins, while they openly contradict the doctrine of the prophets. Return thou to me. This may be taken in two senses, either that the Lord exhorts the people to repentance, or that he encourages them to hope for deliverance; but both senses may agree well. We have said that it is the ordinary practice of Scripture, whenever redemption is mentioned, to exhort to repentance; for the Lord wishes to bring us back to himself in this manner, that he may render us fit for receiving his layouts. Besides, as the people, through their unbelief, were very far from cherishing the hope of salvation, it may likewise be taken for a confirmation, that the people may believe that they will undoubtedly return; as if he had said, "Though thou thinkest that I am estranged from thee, yet know that I will take care of thee." And I approve more this latter sense, and think that it agrees better with the context; for the Prophet labors above all things to confirm the promises of God, and to fix them deeply on their hearts. For I have redeemed thee. He commands the Jews to "return to him," though their banishment stood in the way of their expecting that he would be a deliverer; as if he had said, "Though I appear to be estranged from you, yet trust; for I have determined to redeem you."

Footnotes

1 - "A la rigueur." "Rigorously."

I have blotted out - The word used here (מחח mâchâh), means properly "to wipe away," and is often applied to sins, as if the account was wiped off, or as we express it, blotted out (Psalm 51:3, Psalm 51:11; see the note at Isaiah 43:25). The phrase, 'to blot out sins like a cloud,' however, is unusual, and the idea not very obvious. The true idea would be expressed by rendering it, 'I have made them to vanish as a thick cloud;' and the sense is, as the wind drives away a thick cloud, however dark and frowning it may be, so that the sky is clear and serene, so God had caused their sins to disappear, and had removed the storm of his anger. Nothing can more strikingly represent sin in its nature and consequences, than a dense, dark, frowning cloud that comes over the heavens, and shuts out the sun, and fills the air with gloom; and nothing can more beautifully represent the nature and effect of pardon than the idea of removing such a cloud, and leaving the sky pure, the air calm and serene, and the sun pouring down his beams of warmth and light on the earth. So the soul of the sinner is enveloped and overshadowed with a dense cloud; but pardon dissipates that cloud, and it is calm, and joyful, and serene.
And as a cloud - The Chaldee render this, 'As a flying cloud.' The difference between the two words rendered here 'thick cloud,' and 'cloud' ( עב ‛âb and ענן ‛ânân) is, that the former is expressive of a cloud as dense, thick, compact; and the latter as covering or veiling the heavens. Lowth renders the latter word 'Vapour;' Noyes, 'Mist.' Both words, however, usually denote a cloud. A passage similar to this is found in Demosthenes, as quoted by Lowth: 'This decree made the danger then hanging over the city pass away like a cloud.
Return unto me - Since your sins are pardoned, and such mercy has been shown, return now, and serve me. The argument here is derived from the mercy of God in forgiving them, and the doctrine is, that the fact that God has forgiven us imposes the strongest obligations to devote ourselves to his service. The fact that we are redeemed and pardoned is the highest argument why we should consecrate all our powers to him who has purchased and forgiven us.

I have blotted out, as a thick cloud, thy transgressions, and, as a cloud, thy sins "I have made thy transgressions vanish away like a cloud, and thy sins like a vapor" - Longinus admired the sublimity of the sentiment, as well as the harmony of the numbers, in the following sentence of Demosthenes: Τουτο το ψηφισμα τον τοτε τῃ πολει τερισταντα κινδυνον παρελθειν εποιησεν ὡσπερ νεφος. "This decree made the danger then hanging over the city pass away like a cloud." Probably Isaiah alludes here to the smoke rising up from the sin-offering, dispersed speedily by the wind. and rendered invisible. He who offered his sacriflce aright was as sure that the sin for which he offered it was blotted out, as that the smoke of the sacrifice was dispersed by the wind, and was no longer discernible.

I have blotted out as a thick cloud thy transgressions, and as a cloud thy sins,.... Sins and transgressions are compared to clouds, for the number of them, they being many as the fleeting clouds of the air; and for the nature and quality of them: as clouds are vapours rising out of the earth and sea, so these arise out of the earthly and corrupt heart of man, which is as a troubled sea; and, like the clouds, they reach up to the heavens, and the cry of them calls aloud for vengeance from thence; they cause darkness, even all that darkness, both in unregeneracy, and after conversion; they intercept the light of God's countenance, and interpose between God and the souls of men, and cause him to hide his face from them; they come between them and the sun of righteousness, and cover him out of their sight; and by means of them the light and comfort of the Holy Spirit are withdrawn; and they hinder the free passage of prayer to God, at least as to the apprehension of God's people; see Isaiah 59:2, and they portend a storm, and threaten with a tempest of divine wrath and vengeance; but God graciously forgives them; which is meant by "blotting" them out. Clouds are blotted out either by the wind dissipating and scattering them; or by the sun breaking through them, conquering and dispersing them, which perhaps is alluded to here; and designs not the satisfaction of Christ for sin; by which he has finished and made an end of it; but rather God's act of pardon upon it, and the application of it to his people; or the discoveries of it by Christ himself, the sun of righteousness, arising upon them with healing in his wings, that is, with pardon to their souls; saying to them, thy sins, though many, are forgiven thee; and they are so blotted out and removed as to be seen no more, and as if they had never been, as a cloud is; not only no more seen by the avenging eye of divine justice, but so removed from them as not to be seen by them, as to have no more conscience of them, or feel the load and burden of them; and though other clouds or sins may arise, yet these also are blotted out in the same way, and shall never appear against the saints to their condemnation. And as, when clouds are blotted out, there is a clear sky, a serene heaven, the sun shines in its brightness, and everything is pleasant and delightful; so when sin is pardoned, or it appears to be so, then God is beheld as the God of all grace, as all grace and love; the sinner can go with a holy boldness to him, through the blood of Christ, as being pardoned, and has fellowship with him; the evidences of interest in Christ become clear, and the comforts of the Holy Ghost are enjoyed. And let it be observed, that as no man can reach the clouds, and blot any of them out; so none can forgive sins but God, this is his sole prerogative, Isaiah 43:25. Here is mention made of a cloud, and a thick cloud; no clouds are so thick but God can blot them out, and these are no sins so great but he can forgive them; clouds, and thick clouds, are blotted out, lesser and greater sins are forgiven by him. Some read the words thus, "I have blotted out", wiped or washed away, "as with a thick cloud, thy transgressions, and as with a cloud thy sins" (n); and give the sense thus, as clouds pouring down with rain wash the streets from the filth of them, so the Lord, as with a deluge of pardoning grace and mercy, washes away the sins of his people; grace superabounds abounding sin, and carries it all before it, and removes it clear away; now this blessing of grace is mentioned, to attach the people of God to his service, as it follows:
return unto me, for I have redeemed thee; this supposes them to have backslidden from the Lord in heart or in practice, in life and conversation, or in both, and yet the Lord had forgiven them; and which was a reason why they should return to him by repentance; as nothing is a greater motive to it, or more strongly influences it, than a discovery of pardoning grace; and then the people of God do return to God as their Father, who graciously receives them, and to Christ as their husband, to whom they are married, though backslidden, and to their duty to both. So the Targum,
"return to my worship or service;''
the reason or argument enforcing it is very strong, "for I have redeemed thee"; from sin, and all its sad effects; from the law, and the curses of it; and from death and hell, and wrath to come; and therefore need not fear any of these things, or fear coming to the Lord on account of them. Such, who are redeemed, need not doubt but they shall be kindly received, though they have backslidden, and that no good thing will be withheld from them; for if God has given his Son to redeem them, he will give all things freely with him; besides, being redeemed, they are the Lord's, and therefore ought to return to him, and glorify him with their bodies and spirits, which are his; and as they are redeemed from our vain conversation, they should return from it, and not indulge one, or otherwise the end of redemption is not answered: and this being joined with the forgiveness of sin in the preceding clause, shows that that proceeds upon the foot of redemption, or upon the foot of satisfaction made by Christ; and both furnish out arguments engaging to the service of God.
(n) So some in Gataker.

blotted out--the debt of thy sin from the account-book in which it was entered (Exodus 32:32-33; Revelation 20:12).
as a thick cloud--scattered away by the wind (Psalm 103:12).
as a cloud--a descending gradation. Not only the "thick cloud" of the heavier "transgressions," but the "cloud" ("vapor" [LOWTH], not so dense, but covering the sky as a mist) of the countless "sins." These latter, though not thought much of by man, need, as much as the former, to be cleared away by the Sun of righteousness; else they will be a mist separating us from heaven (Psalm 19:12-13; 1-John 1:7-9).
return . . . for--The antecedent redemption is the ground of, and motive to, repentance. We do not repent in order that He may redeem us, but because He hath redeemed us (Zac 12:10; Luke 24:47; Acts 3:18-19). He who believes in his being forgiven cannot but love (Luke 7:43, Luke 7:47).

As a cloud - So that there is no remnant of it left.