There reigned in silence," which horrifies her maid Alisa.  
Before one of the characters in this opera kills himself, he sings the aria "You who have spread your wings to God."  When we first see the title character, she sings the aria "There reigned in silence," which horrifies her maid Alisa.  One highlight of the opera is the sextet "Who restrains me at this moment?" which is sung in Act 2 after the signing of a wedding contract.  After the title character murders Arturo on their wedding night, she undergoes a notorious "Mad Scene," and she dies soon after, after which her true love Edgardo, a member of the Ravenswood family, dies also.  FTP, name this 1835 opera which is set in a Scottish castle, a work by Gaetano Donizetti based on a novel by Sir Walter Scott.
Before one of the characters in this opera kills himself, he sings the aria "You who have spread your wings to God."  
Lucia di Lammermoor