Shared ground
Isaiah 26:5–7 presents a reversal: a “lofty city” is forced down to the ground and reduced to dust, and what once seemed untouchable becomes something people can walk over. The acting subject (“he”) is portrayed as the one who brings the high down, not merely as an observer of history (explicit in vv. 5–6).
The image is not only about destruction but about status being overturned. The “poor” and “needy” are named as the ones whose feet tread over the ruins (v. 6), highlighting that those who were socially vulnerable are no longer blocked by the powerful.
The passage then shifts from the ruined city to the “way” of the just. Their path is described as level/straight, and “the Upright One” is said to make the just person’s path smooth or directed (v. 7). The text links moral order with God’s ordering of outcomes (explicit claims across vv. 5–7).
Where interpretation differs
Some readers take the “lofty city” as a specific historical capital that symbolized imperial pride (often connected with major enemy powers). Others read it as a deliberately broad symbol for human arrogance and oppressive power, without tying it to one named place.
Some also differ on whether the “treading down” (v. 6) should be imagined as literal conquest and aftermath (survivors walking through ruins) or as poetic shorthand for a complete reversal of status.
A smaller difference concerns v. 7: whether “uprightness/levelness” mainly describes the just person’s life-route (their circumstances and direction) or mainly describes their moral character, with the “path” language serving as a metaphor.
Why the disagreement exists
The passage never names the city, and prophetic songs often blend real events with symbolic imagery. Also, the language is highly pictorial (“dust,” “tread it down”), which can be read either as describing a historical scene or as a generalized portrayal of how God brings down pride. Finally, “way/path” language can naturally point to both conduct and the course of life, making the emphasis in v. 7 easy to weight differently.
What this passage clearly contributes
It contributes a clear claim that God brings down what is elevated in pride and power (“lofty city” laid low to dust), and that the outcome includes a reversal in which the poor and needy are no longer dominated by that power (they tread over it). It also contributes the claim that the lives of the just are not pictured as random or directionless: the Upright One actively makes their path level and straight (v. 7). The text holds together divine action in judgment (vv. 5–6) and divine guidance in moral order (v. 7) without explaining every mechanism.