It's quite tempting to also list those pieces of poetry and hymns quoted (some extensively) but not mentioned by title, but I will resist. If I go down that road it will become endless toil and spoil the reading for me.
I may have missed some, but I hope not many.
Coriolanus by Shakespeare
"La Jeune captive" by André Chénier
"The Castaway" by William Cowper
"Puir Mary Lee" (Scottish)