If asked to recommend only one book to read at the end of the world, I would answer Nietzsche's "Thus Spoke Zarathustra." In my twenties, whenever life felt tough and difficult, I would pick up this book and find comfort and courage within its pages. I would like to introduce it to you as the one book to take to the end of the world.

"Among my works, 'Zarathustra' stands alone. With this book, I have given humanity the greatest gift ever bestowed. This book, with a voice that will resonate for thousands of years, is the greatest of all books that exist, filled with the loftiest spirit, with all human affairs lying far beneath it. Moreover, this book is the deepest of books, born from the richest depths of truth, and it is an inexhaustible well from which gold and extraordinary treasures flow forth, no matter how many times you draw from it."
-Nietzsche, "Ecce Homo" Preface