The Isaianic vision places its appetite for rhetorical questions in the service of wonderment over YHWH’s redemptive surprises, his new things.
Two prominent examples leap to mind.
First, bereaved and barren Zion finds herself caught up in the sudden appearance of daughters and sons somehow conceived in her time of desolation.
Surely your waste and your desolate places and your devastated land— surely now you will be too crowded for your inhabitants, and those who swallowed you up will be far away.
The children born in the time of your bereavement will yet say in your hearing: ‘The place is too crowded for me; make room for me to settle.’
Then you will say in your heart, ‘Who has borne me these? I was bereaved and barren, exiled and put away— so who has reared these? I was left all alone— where then have these come from?‘
Isaiah 49.19-21 (NRSV, emphasis added)
Contemplating the flow towards Zion of long-lost sons and daughters, YHWH asks on behalf of Mother Zion.
Who are these that fly like a cloud, and like doves to their windows?
Isaiah 60.8 (NRSV, emphasis added)
I mention these two passages in order to illuminate the rhetoric of sudden appearance. In the passage under review, this motif finds its counterpart in the expression of sudden disappearance.
Yes, all who are incensed against you shall be ashamed and disgraced; those who strive against you shall be as nothing and shall perish.
You shall seek those who contend with you, but you shall not find them; those who war against you shall be as nothing at all.
(Isaiah 41:11-12 NRSV, emphasis added)
The rhetorical question does not figure in this second motif, nor does the flood-tide of previously unimagined children streaming to their astonished mother. The mode here is not interrogative but plainly descriptive. The subjects in question are not Zion’s children but the people’s enemies.
However, the reversal of sudden appearance in the interest of sudden disappearance hinges on important formal symmetries.
Both traffic in the language of the sudden and the astonishing. Both register their truth from the perspective of the affected observer, who is in fact the same subject if one grants the likelihood that YHWH’s servant in Isaiah 41 and Mother Zion in the previously cited passages are coterminous.
Where have they gone? Where have they come from? Who are they?
Such is the interrogative accent of the redeemed. So rings the perpetual surprise of those whom YHWH has restored.