The heavens opening is the inner sky of consciousness breaking open, and it happens to one held captive, which is exactly the human condition: awareness bound inside flesh and circumstance, sitting beside the flowing river of its own passing thoughts. Only there, in captivity and by the moving water, does the vision come. The opened heavens are not a place overhead but the ceiling of the ordinary mind giving way, so that what was always present becomes seen. Ezekiel, whose name means God strengthens, is the awareness made strong enough to bear the sight. The exile did not have to end first; the seeing came while he was still bound.
River of Chebar: the flowing current of a person's own thoughts, the stream one sits beside in exile.
The captives: awareness bound inside flesh and circumstance, the ordinary state before the sky opens.
Heavens opened: the ceiling of the everyday mind giving way, so the always-present is finally seen.
Ezekiel: the awareness made strong enough to bear the vision, the self God strengthens.