Undone task

A one-foot wide ledge runs along the outside wall of a timeless church, encircling the entire building at waist level. An endless amount of letters are evenly distributed on its surface, at random, following no pattern. The letters are waiting for someone to arrange them into the words and sentences and paragraphs and sections and chapters of a book that needs existing. Although rumours have it that many have been the ones who tried the task remains undone to this day.