FN FMCCFX HH ACESDGHL

Disappointed by the meagre offerings for puzzle solving on the Sherlock website, I've spent a quiet afternoon putting together the following:

DWFT FG H LJXDUERA OAT IBCQ H IGKJCFMH HIB FNCUJC DKCGBRCWG KJB HACKDR JWB XIPIMJ CIP H LDUB UBJFX HUGU F GALF JEVBUDR H ZAUA FJOHLC TEX H OAEIABMB JDQC IJ BBBD QDG DDDU IZAOEAGY DRAK H VAU JBCTCCD JIMES H BFX IN CQB SF YG AERG KA OGXI JAYAOG VIX BPA SD LAND FIMERIL IB CJAEIU

Just to add to the joy, there may well be transcription errors. I've tried my best to make sure there aren't.

Questions:

Where's the quote taken from?
What is the cipher used?
Is there a website that lets me do this automatically?

Comments are screened.

Actual update and so on.

Moth looooooooooves me. She also has a bit of a chicken problem. If she sees that there's chicken in the fridge, she'll come and seek me out to say OH HAI THUR, DIDJA KNOW THERE'S CHIKKIN AND IT IS IN THE FRIJ AND NOT IN MAI BOWL?? or something similar. This would be adorable, but it's less sweet if you're trying to sleep off a migraine and standing on your head going MY CHIKKEN, LET YOU SHOW ME IT. Any worries I had about her eyesight have dissipated. She can see roast chicken from an unusual angle at ten yards, that's good enough for me.

( Today has been a fairly good day. )

In other words, while I am not a well bunny, I'm better today than in a long while, overall things are improving and I am in a really good mood. Also, I have sweets. Yay!

On a slightly random note, if you want to donate for the Pakistan Floods Appeal, the website is here or you can pick out your individual charity (Oxfam, Red Cross or even go to the Post Office.