The line closes the musical’s Finale, sung as the ensemble reprises the show’s themes after Jean Valjean’s death — a moment of collective hope rather than a passage lifted from Hugo’s prose.
Because the 1985 stage adaptation shares its title and characters with Hugo’s 1862 novel, lines written fresh for the show are routinely mistaken for the novelist’s own words — this is one of the most widely shared examples of that mix-up.
It’s a wonderful line, and well in keeping with the story, but it’s not a Hugo quote.
About the 1985 English lyrics
Kretzmer’s English lyrics, adapted from Alain Boublil and Jean-Marc Natel’s original French libretto (music by Claude-Michel Schönberg), expanded the show for its 8 October 1985 Barbican Theatre opening and won him a Tony Award and a Grammy.