A phrase can be used so frequently in a novel that quoting it becomes a coded signal you’re a fan of the book. The best example is ‘So it goes’ from SH5. It’s a motto, a tattoo, a stand alone Reddit post comment. For those who can’t place the quote it also serves as a cultural shibboleth.
But the only other ones I can think of are ’Es muss sein’ from TULoB and ‘Oh my valves!’ from CoD. (Why are all three words?!) But there must be others. I don’t mean famous one liners, I’m talking about multiple uses of a phrase. Can anyone mention another?
“May the odds be ever in your favor.”
“Fire wants to burn, water wants to flow, air wants to rise, earth wants to bind, chaos wants to devour.”
“All animals are equal, but some animals are more equal than others”
“We are the dead.”