And when he had put his hand on mine with a cheerful look, wherefrom I took courage, he brought me within to the secret things. Here sighs, laments, and deep wailings were resounding through the starless air; wherefore at first I wept thereat. Strange tongues, horrible utterances, words of woe, accents of anger, voices high and faint, and sounds of hands with them, were making a tumult which whirls always in that air forever dark, like the sand when the whirlwind breathes.

When we encountered a band of souls coming along the barrier, and each was gazing at us in the evening people gaze at one another under the new moon

Because your question searches for deep meaning, I shall explain in simple words

There sighs, lamentations and loud wailings resounded through the starless air, so that at first it made me weep; strange tongues, horrible language, words of pain, tones of anger, voices loud and hoarse, and with these the sound of hands, made a tumult which is whirling through that air forever dark, and sand eddies in a whirlwind.

And as he, who with laboring breath has escaped from the deep to the shore, turns to the perilous waters and gazes.

All hope abandon, ye who enter here!

At grief so deep the tongue must wag in vain; the language of our sense and memory lacks the vocabulary of such pain.