Cardiff often passes around a notebook at his shows called a "Book of Truths". Audience members are then asked to contribute to this notebook by writing something inside, "... a story, a confession, a hope, a secret." "The nature of performing is very egotistical," he has said in the past. "There is one microphone and generally I get to have it for most of the time … the book just came from a place of wanting to give people an outlet to write down some of these stories."