“‘I must take the A Train’ said the butterfly politely” and “It cannot be ill fortune to have loved a unicorn. Indeed, it must be the [best?] luck, though the hardest earned” both from "The Last Unicorn by Peter Beagle.
The obligatory LOTR:
“Do not meddle in the affairs of wizards, for they are subtle and quick to anger” -Gandalf maybe???
and “Do not meddle in the affairs of dragons, for you are crunchy and taste good with ketchup” --No idea…