George P. Upton,
The Standard Oratorios: Their Stories…
“ The first six parts seem to have included nearly all that can be done, and you wonder if the last part, the "Libera me," will not fall tamely; when to your surprise it proves to be the grand culmination of the work, and presents, with its solo and chorus and imposing fugue, an ensemble of effect, a richness of instrumentation, a severe and almost classical form of composition, and a dramatic intensity and passion that sweep the whole range of power, from a fortissimo tutte forza, down to the faintest whisper of a pianissimo. ”
