Throughout the work, Verdi uses vigorous rhythms, sublime melodies, and dramatic contrasts—much as he did in his operas—to express the powerful emotions engendered by the text. The terrifying (and instantly recognizable) Dies irae that introduces the traditional sequence of the Latin funeral rite is repeated throughout for a sense of unity, which allows Verdi to explore the feelings of loss and sorrow as well as the human desire for forgiveness and mercy found in the intervening movements of the Requiem.