The interpretation timeline
Isaiah 26:18 Douay-Rheims

We have conceived, and been as it were in labour, and have brought forth wind: we have not wrought salvation on the earth, therefore the inhabitants of the earth have not fallen.

A.D. 389 – 1871 8 witnesses

Patristic

before A.D. 750
389
A.D.
A.D. 329–390
“Let us talk about how "mercy is put in the balance" as holy Isaiah declares, for goodness is not without discernment, as the first laborers in the vineyard fancied, because they could not perceive any distinction between those who were paid alike. And [let us talk about] how anger, which is called "the cup in the hand of the Lord" and "the cup of falling which is drained," is in proportion to transgressions, even though he abates to all somewhat of what is their due and dilutes with compassion the unmixed draught of his wrath. For he inclines from severity to indulgence toward those who accept chastisement with fear and who after a slight affliction conceived and are in pain with conversion and bring forth the perfect spirit of salvation. But nevertheless he reserves the dregs, the last drop of his anger, that he may pour it out entire upon those who, instead of being healed by his kindness, grow obdurate, like the hard-hearted Pharaoh, that bitter taskmaster, who is set forth as an example of the power of God over the ungodly.”
Source
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“Isaiah also, proclaiming the resurrection to the people, says that he is the announcer of the Lord's message, for we read thus: "For the mouth of the Lord has spoken, and they shall speak in that day." And what the mouth of the Lord declared that the people should say is set forth later on, where it is written: "Because of your fear, O Lord, we have been with child and have brought forth the Spirit of your salvation, which you have poured forth upon the earth. They that inhabit the earth shall fall; they shall rise that are in the graves. For the dew which is from you is health for them, but the land of the wicked shall perish. Go, O my people, and enter into your chambers; hide yourselves for a little until the Lord's wrath pass by."”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“Even now let us rejoice somehow or other in this hope derived from the promises of one most faithful, until that richest of all possible joys arises, when "we shall be like him, because we shall see him as he is," and our joy nobody shall take from us. Of this hope, you see, we have also received already the acceptable and freely given pledge that is the Holy Spirit, who produces in our hearts the unutterable groanings of holy desire. "For we have conceived," as Isaiah says, "and have brought forth the spirit of salvation." And, "when a woman is in labor," the Lord says, "she has sorrow, because her day has come; but when she has brought forth, there is great joy, because a human being has been born into the world." This will be the joy that nobody will take away from us; on the day when we are brought forth into the eternal light from this conception of faith. So meanwhile let us fast and pray, while it is still the day of bringing forth.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“We conceived, we shuddered a shudder like a woman giving birth, as though we had given birth, as though we were close to being redeemed, yet it was wind and no salvation. we wreak no salvation [in] the land We have suffered everything, and our troubles (sic) we do not understand for ourselves a salvation.[Rashi in Nach Lublin] ([Warsaw edition reads:] With all our suffering and our trouble, we do not prepare salvation for ourselves.) ([K’li Paz reads:] with all our pains and our troubles, we do not bring salvation for ourselves.) ([Some manuscripts read:] Throughout our troubles we do not see any salvation.) ([Others read:] We do not recognize any salvation.) ([Others read:] We cannot prepare for ourselves any salvation.) neither do the inhabitants of the world fall The nations (var. the children of Esau), who are the inhabitants of the world, since they conquered and filled the earth, do not fall. And Jonathan rendered יִפְּלוּ as an expression related to (Ex. 33:16): “And wonders shall be wrought (וְנִפְלִינוּ) for me and Your people.” The inhabitants of the world cannot perform a wonder.”
Source
1167
A.D.
Ibn Ezra Jewish
1089–1167
“We have conceived, we have been in pain with, as we have brought forth, wind. We have conceived, and we have been in pain with wind, and so we have also brought forth wind. We had no strength to deliver ourselves; this is the meaning of the following ישועות בל נעשה we have not wrought any deliverance. We were not able to bring any deliverance. ארץ In the earth. Supply ב; comp. בששת=ששת (Ex. 20:11). ובל יפלו Some say, that א is omitted, as in ויפלו (Neh. 6:16); but the latter has its usual meaning (and they fell), as will be explained by me. I explain בל יפלו we could not help their falling.”
Source
1256
A.D.
Thomas Aquinas Catholic
1225–1274
“In that day. In this part he gives thanks for the justification of the people; and it is divided into two. In the first he foretells the state of the just; in the second he shows the fruit of justice, "the old error." Concerning the first, two things. For first he foretells the confidence of the just, "in that day," after the return from captivity, and the affliction of the Moabites by the Maccabees; or after the coming of Christ. O Sion — "the savior" is Christ, or Judas Maccabeus; "the city of strength" is by Maccabean protection; "wall and outwork will be set" — for them alone, according to the letter, in the time of the Maccabees; or the wall is Christ, the outwork the prophets. Or otherwise, Sion is the city, the savior is God, or Christ, or Judas Maccabeus. Wall, that is, one defending as a wall. Proverbs 18: the name of the Lord is a most strong tower. Zechariah 2: I will be to them, says the Lord, a wall of fire round about. Second, the Lord proclaims their justice, saying to the Angels, "open the gates" — of heaven, or of virtue, closed by sins; or, according to the letter, you need not close the gates on account of unbelievers, because all will be just. Psalm 117: this is the gate of the Lord; the just shall enter into it: "the old error." Here he sets down the fruit of justice, namely peace; concerning which, first is set down the people's petition, which contains three things. For the fitness of the petitioners is proposed, "the old error," namely of idolatry: 2 Corinthians 5: the old things have passed away. The benefit of peace is requested, "you will keep peace," of body and soul. Below, 32: my people shall sit in the beauty of peace. The merit of peace is alleged: "because we have hoped in you." Ecclesiasticus 2: who has hoped in the Lord, and has been confounded? Second is set down the prophet's response, who is mediator between the people and God, "you have hoped." And it is divided into three. In the first is set down the promise of peace; in the second, the obtaining of peace, "the path of the just is right"; in the third, the announcement of the peace obtained, "justice." Concerning the first, three things. First he grants the merit: "you have hoped in the Lord" "forever," that is, always. Psalm 27: in him my heart has hoped, and I have been helped. Second he adds counsel, "in the Lord God" — supply, "hope." Matthew 10: he who perseveres to the end, he shall be saved. Third he promises the benefit of peace, in return for the destruction of enemies: "because he will bend down those who dwell." The Jews refer this to the Romans. But it can be referred to any of their enemies whatsoever. Or mystically to the Jews themselves. Above, 25: the fortifications of your high walls shall fall. And he adds the condition of those who destroy it: "the foot of the poor shall trample it" — of the Jews, who has little; "of the needy," who needs to have more. Or if mystically, he sets down the merit of the destruction of the Jews on account of the poor Christ, concerning whom in Psalm 69: but I am needy and poor. And elsewhere, 68: I am poor and sorrowful. "Of the needy" — of the disciples. "The path of the just." Here is set down as it were a debate of the prophet with the Lord, for obtaining the people's petition: and first he induces him to punish the enemies through arguments; second, through experiences, "you have been indulgent." Concerning the first, two things. First he induces him to punish; second, that he keep them detained in punishment, "those dying." Concerning the first, three things. First he induces to justice; second he excludes mercy, "let us have mercy"; third he determines the punishment, "and he shall not see." Now he provokes to justice, proposing three things. First, the rightness of justice, "the path of the just," that is, of justice. Wisdom 10: the Lord leads the just through right ways. Second, the expectation of the afflicted, proposing three things: the expectation itself, "in the path," that is, through the punishment of your judgments, by which you avenge and free us. Psalm 118: I will never forget your justifications, because by them you have given me life. The desire of those who wait, "your name." Jeremiah 23: this is the name that they shall call him, the Lord our just one. The constancy of desire: "because day and night," that is, at all times, or in prosperity and adversity, "my soul." Canticle 3: on my bed I sought him whom my soul loves. Psalm 62: O God, my God, to you I watch from first light. Third he proposes the usefulness of justice, "when you shall have executed judgments." Psalm 9: the Lord shall be known, executing judgments. "Let us have mercy." Here he excludes mercy; and concerning this he does two things. First the Lord proposes mercy by way of question, "let us have mercy." Psalm 32: the earth is full of the mercy of the Lord. Second the prophet excludes it, on account of its uselessness, "and he shall not learn." Ecclesiastes 8: because the Lord does not quickly bring forth sentence, the children of men commit evils. Ecclesiasticus 30: an unbroken horse turns out stubborn, and a son left to himself turns out headstrong. And on account of the gravity of the sin, on account of the profanation of the sacred place, "in the land of the saints." Psalm 78: O God, the nations have come into your inheritance, they have polluted your holy temple. Jeremiah 11: what is it that my beloved has done many wicked things in my house? "And he shall not see." Here is set down the debate over determining the punishment: and first the Lord asks, "and he shall not see," as if to say: must I give him this punishment, that he not see? Or in a diminished sense, and this suffices for punishment. Second the prophet answers: "Lord, let it be exalted." Third the Lord determines the punishment, spiritual: "let them see and be confounded": Apocalypse 1: every eye shall see him, in the glory of his humanity, not of his divinity; and corporal: Apocalypse 19: they were sent into the pool of fire. Fourth the prophet, rejoicing together, consents, proposing two goods following from the said punishment: the peace of the people. Therefore, Lord, this being done, you will give peace; and this we hope from you; "for all things." Philippians 2: it is God who works in us to will and to accomplish: "you have worked," "works," that is, the punishments by which you have sufficiently purged us. Below, 40: she has received from the hand of the Lord double. Second, the praise of God: "Lord God, they have possessed"; and therefore we have not been able to devote ourselves to your praise. "Only in you," not having another god to whom alone we might devote ourselves. Lamentations, last chapter: servants have ruled over us. Note on that word, "city of strength," that Christ is the city of our strength, because he confirms us, first, in faith. 1 Corinthians 3: no one can lay another foundation besides that which has been laid, which is Christ Jesus. Second, in hope. Hebrews 6: we who have fled for refuge might have the strongest comfort in holding fast the hope set before us. Third, in charity. Ephesians 3: rooted and grounded in charity. Luke 12: I have come to send fire upon the earth. Fourth, in work. Philippians 2: God who works in us to will and to accomplish, for good will. Fifth, in temptation. 1 Corinthians 10: God is faithful, who will not permit you to be tempted beyond what you are able. Sixth, in accusation. 1 John 2: we have an advocate with God, Jesus Christ. Seventh, in reward. Apocalypse 3: I will make him a pillar in the temple of my God. Again, note on that word, "open," that we ought to open the gates through meditation, first on the misery of hell; below, 38: I shall go to the gates of hell. Second, on the just life. Proverbs, last chapter: let her works praise in the gates. Third, on heavenly glory. Psalm 147: he has strengthened the bolts of your gates. Again, note on that word "peace," that there are three things which make peace in the present life. First, contempt of temporal wealth. Below, 57: but the wicked are like the raging sea, which cannot rest. Second, the subjugation of carnal concupiscence. Ecclesiasticus 44: making peace in their houses. Third, contemplation of divine wisdom. Psalm 75: his place is made in peace, and his abode in Sion. Again, note on that word, "the path of the just," that it is the right way of justice, first, on account of the shortness of the journey. Wisdom 5: we have walked difficult ways. Second, on account of the evenness of its course: whose midpoint does not diverge. John 13: knowing that he goes to God. Third, on account of its beauty. Jeremiah 31: may the Lord bless you, beauty of justice, holy mountain. Note on that word, "peace," that there are three things which make peace in the life to come. First, the abundance of goods. Psalm 147: he has placed peace in your borders. Second, security from evils. Below, 32: my people shall sit in the tabernacles of confidence. Third, immobility. Psalm 4: in peace, in the very same, I will sleep and I will rest. "Those dying." Here he asks that he not free those punished further from punishment. And first he sets down the petition: "let dying sinners not live" — the life of glory — unless they repent. "Let the giants," glorying in their power, "not rise again" — to glory. Psalm 1: the wicked shall not rise again. Ecclesiasticus 16: the ancient giants did not obtain pardon for their sins. Or he asks that their enemies, cast down, may not rise again further to power. Second he sets down the being heard: "therefore." Psalm 9: let their memory perish with a sound. Jeremiah 8: in the time of their visitation they shall fall. "You have been indulgent." Here he induces God to the work of justice through experience. And first through experience among the gentiles, second among the Jews: "as she who has conceived." Concerning the first, two things. First he proves through experience the uselessness of mercy: both as to the remission of punishments, "you have been indulgent"; and as to the multiplication of goods, "you have extended." Jeremiah 5: they have grown great and rich, and are grown fat and sleek, and have most wickedly passed over my words. Proverbs 1: the prosperity of fools. Second, the usefulness of avenging justice, "Lord, in distress." Hosea 6: in their tribulation they will rise early to me. Jeremiah 2: in the time of affliction. "As she who has conceived." Here he proves the same through experience among the Jews. And first he sets down the scourge of tribulation, "as she who has conceived." John 16: a woman, when she gives birth, has sorrow. Psalm 47: there, pains as of a woman in labor. Second, the fruit of amendment, "from your face." Hebrews 12: now all discipline, indeed, in the present seems not to be of joy but of sorrow; but afterward it yields to those exercised by it the most peaceful fruit of justice. "We have not done justice." Here he announces the peace obtained: and concerning this he does three things. First is shown the reason for the delay, "we have not done justice," so that it alludes to what is said in Deuteronomy 28: the Lord will give your enemies, who rise up against you, falling down before your face. Second is set down the promise of the restoration of the people through resurrection, whether bodily on the last day, or from the misery of captivity. Whence the resurrection is promised. "The dead shall live": the voice of the prophet to the Lord; Ezekiel 37; the giving of thanks is enjoined upon those rising again: "awake." Daniel 12: many of those who sleep in the dust of the earth shall awake. And the cause, or reason, of the resurrection is assigned: "because the dew," namely divine kindness. Hosea 6: and he shall come, etc. Third is shown the destruction of the enemies (and concerning this he sets down three things. First, the destruction itself): "the land of giants," that is, of the proud and powerful. Above, 17: it shall be like a heap of stones in ruin. Second, the exemption of the people of God, "go, my people." "Chambers" — tombs; or, according to the letter, the fortification in which meanwhile they cautiously keep themselves guarded. Below, 54: in a moment of indignation I hid my face for a little while from you; and with everlasting mercy I have had mercy on you. Apocalypse 7: it was said to them that they should rest yet a little while, until the number of their brethren should be completed. Third he sets down the order of destruction, because it is through judgment: whence he sets down the coming of the judge, "for behold the Lord." Micah 1: behold the Lord will come forth, and the manifestation of crimes: "and he will reveal." Job 16: O earth, cover not my blood, and let not my cry find a hiding place in you.”

Post-Reformation

c. 1650 – 1900
1849
A.D.
1774–1849
“Wind. Our expectation of aid from others has been disappointed. (Calmet) — Septuagint, “the spirit of thy salvation, which thou hast wrought on the earth. We shall not fall, but the inhabitants of the earth shall fall.” (Haydock) — Their copies must have been different from ours. — Fallen. The Chanaanites are left for our trial and punishment. (Calmet)”
Source
1871
A.D.
1871
“brought forth wind--MICHAELIS explains this of the disease empneumatosis. Rather, "wind" is a figure for that which proves an abortive effort. The "we" is in antithesis to "Thy," "my" (Isa 26:19), what we vainly attempt, God will accomplish. not wrought . . . deliverance in . . . earth--literally, "the land (Judea) is not made security," that is, is not become a place of security from our enemies. neither . . . world fallen--The "world" at large, is in antithesis to "the earth," that is, Judea. The world at enmity with the city of God has not been subdued. But MAURER explains "fallen," according to Arabic idiom, of the birth of a child, which is said to fall when being born; "inhabitants of the world (Israel, Isa 24:4; not the world in general) are not yet born"; that is, the country as yet lies desolate, and is not yet populated.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.