It's a Dangerous Business, Going Out Your Door

Sam: "This is it." Frodo: "This is what?"

Sam: "If take one more step, it'll be the farthest away from home I've ever been."

Frodo: "Come on, Sam. Remember what Bilbo used to say: 'It's a dangerous business, Frodo, going out your door. You step onto the road, and if you don't keep your feet, there's no knowing where you might be swept off to.'"

~ JRR Tolkien, Lord of the Rings: The Fellowship of the Ring