Which Book Would You Commit To Memory?

I've come across a discussion by Marylaine Block in which she poses the question "What books would you commit to memory to save from the bookburners, if you lived in the nightmare world of Fahrenheit 451?" She provides her answers to the question here and also gives her readers' answers here. I think my pick would be Jane Austen's Mansfield Park—it's my all-time favourite book, and I can't imagine a world without it. Via Book Bytes.