I shall not see thee. Dare I say No spirit ever brake the band That stays him from the native land Where first he walk'd when claspt in clay?
No visual shade of some one lost, But he, the Spirit himself, may come Where all the nerve of sense is numb; Spirit to Spirit, Ghost to Ghost.
O, therefore from thy sightless range With gods in unconjectured bliss, O, from the distance of the abyss Of tenfold-complicated change,
Descend, and touch, and enter; hear The wish too strong for words to name; That in this blindness of the frame My Ghost may feel that thine is near.
Alas, Tennyson will never see Arthur again, because the "band," or barrier that separates the living from the dead, has never been broken.
He'll not be able to actually see his friend again, although his spirit could return and reach out to the speaker's spirit: "Spirit to Spirit, Ghost to Ghost." So, the only reunion they will enjoy will be a spiritual one, and not a for-reals one.
He longs for even this kind of reunion, and pleads with Arthur's spirit to come down and enter his own, so that his spirit can feel Arthur's near.