Anyone who has stood beside a stream knows the odd feeling that it is talking, and that you are not quite being addressed. "Indwelling" begins from that feeling and turns it into an argument about what can and cannot be shared between one being and another. The brook sings, the listener passes, and the poem insists that nothing comes back across the gap: "No one has ever heard / The song of a brook reply." Reading it, you realise the brook is only the occasion. The real subject is how any inner life, whether a stream's, a person's, or something larger, remains out of reach even while it pours itself out in full view.
The title is the first clue. To "indwell" is to live within, and the poem keeps circling something that lives inside the water without ever being handed over by it. The second stanza states the paradox most clearly. The brook goes on singing "in its varied course," yet the voice is "never the self-same," and so it "reveals" nothing about "the pulse at its source." Notice the word pulse. It quietly turns the brook into a body with a heartbeat, so that what we hear on the surface is like a voice that tells us nothing of the heart behind it. Expression, the poem suggests, is not the same as disclosure. You can be surrounded by sound and still know nothing of where it comes from.
The third stanza supplies the poem's most memorable idea, and it will sound familiar to anyone who has met the old saying about not stepping into the same river twice. Here it is made tactile and slightly stricter. Ice and a "trickle or two" are the only exceptions, the only moments when water holds still enough to be handled repeatedly, and even these are described grudgingly: "Except for a surface freeze." The comparison is bleak in a quiet way. To touch the water twice you must either stop it, which kills the running, or settle for a mere "trickle," a diminished version. Whatever is alive in the brook exists only in motion, and motion means it is already gone as your fingers close.
The form supports this. The poem runs to four quatrains of short, plain lines, mostly built on a few strong stresses, and the rhyme is deliberately loose. "Reply" and "by" rhyme cleanly in the first stanza, but "course" and "source" are an exact match placed where the poem speaks of origins, while "ice" and "twice" snap together with a small, final click. The last stanza then loosens again, pairing "response" with "once," a near-rhyme that stops just short of resolving. That slight failure to chime feels right for a poem about answers that do not arrive. Even the sound pattern withholds a little.
The final stanza widens the frame. The rock, which "yields not any response," is the hard counterpart to the water: where the brook flows and cannot be held, the rock stands and cannot be moved, and both are silent in their own way. Music "falls" from it, a verb that makes the song something dropped and unreturned. Then comes the line that gives the poem its weight: "Something like heaven's withheld / To be touched, if at all, but once." The hedge "something like" matters. The poem does not claim to know what heaven is, only that there is a quality of the transcendent that behaves like the brook, offered once, never repeated, impossible to keep.
What makes the poem significant is its refusal to console. It would be easy to end on comfort, on the idea that the brook's song answers our longing. Instead it settles for a harder and more honest kind of attention: one brief contact, fully lived, with no promise of a second. In that sense the poem asks something of its reader. If a thing can be touched only once, the only sensible response is to notice it while it is passing, which is exactly what the quiet, exact language of "Indwelling" trains you to do.