To this day, Catholic and Protestant lectionaries have only minimal readings from the Book of Revelation, and the Greek Orthodox lectionary omits it altogether. However, Terry K. Eum believes that it is an important book of the Bible which provides direction and sustenance for the life of the Christians and the Church. Terry K. Eum is the author of "Kata Markon"(the Gospel of Mark), "The Original Ending of the Gospel of Mark 16:1-8," "Pros Philemona"(the letter to Philemon), "Iouda" (The letter of Jude), "Yonah" (the book of Jonah), and "Iakwbou" (the book of James).