So here in one sentence (albeit dense) is what this life-restoring kind of question seems to do:
An incisive question, through a playful hypothetical construct, replaces an untrue limiting assumption with a true liberating one, and connects it to a desired outcome.
And here is why (even denser):
The key block to a desired outcome is an untrue limiting assumption lived as true that can be removed only by replacing it with a true liberating assumption inserted into a playful (because hypothetical) question using the subjunctive tense.
E.g. if you knew x, how would you do y? The mind can play inside that construct. And in playing, it embeds the new true assumption and decides on actions and/or changes its feelings. Everything. The brain likes to play, not obey. And the incisive question construct lets it do that. Playful because hypothetical. Wonderful to know.