Therefore shall this iniquity be to you as a breach that falleth, and is found wanting in a high wall, for the destruction thereof shall come on a sudden, when it is not looked for.

therefore this iniquity shall be to you as a breach ready to fall, swelling out in a towering wall, whose breaking shall come suddenly in an instant.

Therefore is this iniquity to you as a breach falling, Swelled out in a wall set on high, Whose destruction suddenly, at an instant cometh.

This sin will be to you like a crack in a high wall, causing its fall suddenly and in a minute.

for this reason, this iniquity will be to you like a breach that has fallen, and like a gap in a high wall. For its destruction will happen suddenly, when it is not expected.

Ideo erit vobis iniquitas hæc quasi ruptura cadens, tumor in alto muro, cujus repente et subito venit fractura.

Therefore shall your iniquity be like a breach falling. This is a threatening of punishment, and Isaiah expresses it by a very appropriate metaphor. He compares wicked men to a wall that is rent, or that bulges out. As the "swelling out" of a wall threatens the ruin of it, because it cannot stand unless all the parts of it adhere closely to each other, so the haughtiness and insolence of wicked men are a sign and very sure proof of their approaching ruin; because the more they are puffed up and swelled without any solid value, [1] the more readily do they throw themselves down headlong, and it is impossible for them not to fall speedily by their own weight. "Rise up," says he, "and act insolently against God; he will quickly put down your presumption and insolence, for it is but an empty swelling." Hence we learn that nothing is better for us than to submit wholly to God, and to keep charge of all our senses, so as to remain chained and bound by his authority; for they who raise themselves by shaking off all humility, destroy themselves by collecting much wind. For a time, indeed, the Lord permits wicked men to swell and utter their big words, that at length, by their "swelling" and idle boasting, they may bring upon themselves ruin and destruction.

Footnotes

1 - "Estans pleins de vent;" -- "Being full of wind."

Therefore this iniquity - That is, this refusing to trust in Yahweh, and this intention to seek the alliance of Egypt. The general sense of the figure here is, that their depending on Egypt would involve them ultimately in complete and awful ruin - ruin that should come upon them as suddenly as when a wall that had been long swelling out gives way.
As a breach ready to fall - Like a breaking forth, or a bursting in a wall.
Swelling out in a high wall - That is, where the foundation is not firm, and where one part of the wall sinks, and it inclines to one side until it suddenly bursts forth. A similar figure is used by the Psalmist Psalm 62:3 :
Ye shall be slain all of you
As a bowing wall shall ye be, and as a tottering fence.
Whose breaking cometh suddenly - Though it has been long leaning and swelling, yet the actual bursting forth would be in an instant. So would it be with the destruction that would come upon the Jews. Though by their sins they had been long preparing for it, yet it would come upon them by a sudden and tremendous crash. So it will be with all sinners. Destruction may seem to be long delayed - as a wall may be long inclining, and may seem to prepare imperceptibly to fall; but in due time it will come suddenly upon them, when too late to obtain relief.

Swelling out to a high wall "A swelling in a high wall" - It has been observed before, that the buildings of Asia generally consist of little better than what we call mud walls. "All the houses at Ispahan, "says Thevenot, Vol. II., p. 159, "are built of bricks made of clay and straw, and dried in the sun; and covered with a plaster made of a fine white stone. In other places in Persia the houses are built with nothing else but such bricks, made with tempered clay and chopped straw, well mingled together, and dried in the sun, and then used: but the least rain dissolves them. "Sir John Chardin's MS. remark on this place of Isaiah is very apposite: Murs en Asie etant faits de terre se fendent ainsi par milieu et de haut en bas. "The walls in Asia being made of earth often cleave from top to bottom." This shouts clearly how obvious and expressive the image is. The psalmist has in the same manner made use of it, to express sudden and utter destruction: -
"Ye shall be slain all of you;
Ye shall be like an inclining wall, like a shattered fence."
Psalm 62:4.

Therefore this iniquity shall be to you as a breach ready to fall,.... Or, "as a falling breach" (m); contempt of the word of God, and trusting in wickedness, rejecting the counsel of God, and placing confidence in the creature, these would be the cause of ruin; which ruin is signified by the breach of a falling wall, or by a breach in a wall, by reason of which it is in danger of falling, and is just ready to fall:
swelling out in a high wall; like a wall that bellies out and bulges, and which, when it once begins to do, suddenly falls; and the higher it is, it comes with more force, and the greater is the fall:
whose breaking cometh suddenly, at an instant; and so it is suggested, should be the ruin of this people; the high towering confidence they had in Egypt would fall with its own weight, and they with it, and be broken to pieces in a moment; and which is further illustrated by another simile.
(m) "sicut ruptura cadens", Montanus, Cocceius, De Dieu. Ben Melech observes, that a breach is after the building is fallen; for the breach does not fall, but it is said on account of the end of it, or what it is at last, as in Isaiah. xlvii. 2. "grind meal" or "flour".

Image from a curve swelling out in a wall (Psalm 62:3); when the former gives way, it causes the downfall of the whole wall; so their policy as to Egypt.

This iniquity - Of trusting to Egypt, shall be like a wall which is high, but swelling forth in some parts, which, upon the least accident, falls down suddenly.