Et O ces voix d'enfants, chantant dans la coupole!
202. V. Verlaine, Parsifal.
In the poem “Parsifal”, Paul Verlaine writes of the deeds of Percival, the knight who heals the Fisher King in the Grail legend. “Parsifal” summarizes the story of Percival and the king:
He has healed the king and now a king, in his pride,
He has himself become — priest of the Holy Grail
The lines cited by Eliot are from the end of the poem:
And O those children's voices, singing in the cupola!