Adriana Mater reunites composer Kaija Saariaho, librettist Amin Maalouf, and director Peter Sellars, whose L’Amour de loin, was such a success here in 2002. Their new work takes place in an unnamed country at war, and its themes—revenge, forgiveness, and redemption—touch the consciousness in profound ways. The New York Times said of its 2006 Paris premiere, “Saariaho has succeeded in forging a work on an emotional scale only occasionally heard in contemporary opera.”