This is needed both for courage and hardcover books.

Why this works

The answer to this riddle is "spine," and it cleverly plays on double meanings. In one sense, "spine" refers to the backbone of a person, which provides physical support and is often associated with courage. In another sense, "spine" denotes the part of a hardcover book that holds the pages together and often displays the title and author. This riddle connects the concept of courage with the structural component of a book, making it a playful and thought-provoking wordplay!