The "Six Spiritual Classics by C. S. Lewis Box Set of Six Paperback Books" is a vintage collection published in 1978 by Macmillan. This box set includes six paperback books by renowned author C.S. Lewis, focusing on spirituality in English language. The titles in the series are iconic works that delve into spiritual themes, making it a valuable addition to any book enthusiast's collection. With its classic works on spirituality and timeless appeal, this book set is a must-have for fans of C.S. Lewis and Christian literature.