Well … you clicked through and read the article about the day last winter when it snowed in Baghdad, right? The last sentence of that article refers to the quotation from James Joyce.
If you're asking what that quotation from "The Dead" means, the short story (first published in 1914) is about a thirty-something Irishman who with his wife attends a festive dinner party with family and friends during Christmastime, perhaps a Twelfth Night feast on the eve of the Epiphany. Nothing that evening seems to happen as he expects it to, and several incidents leave him feeling shallow and pretentious. When preparing to leave the party,
he sees his wife on the stairs, absorbed in thought, as a man sings a song in another room. He stares at her for a moment before he recognizes her as his wife.
Later that night, back at their hotel, he presses her for her thoughts. She tells him that she was thinking about a boy she once loved. Despite his being sick, when it came time for her to leave for convent school, he traveled through the rain to her window, and although he got to speak with her again, he ended up dying within the week. The husband has his own epiphany, realizing that this was probably the love of his wife's life. Once again, he begins to feel his own insignificance in the larger world of the living and the dead — which is how the story ends with that paragraph I quoted.
The snowfall can be interpreted several ways: simply God's healing grace; or with the snowfall's travel from the darkness to earth, a metaphor for how something out of the dim past can alight on us, as the wife's memories did; or with the description on how the snow falls the same whether over land or sea, hill or plain, a metaphor for the complete indifference of fate; or as the narrator says, our quiet journey from life (the heavens) to death (the earth). Regardless, it is one of the most haunting endings in literature.
Director John Huston's last movie was an adaptation of the story, starring his daughter Angelica Huston, with Donal McCann.
The final scene.