SAINT IRENAEUS - THE WORLD IS CONCLUDED IN 6,000 YEARS, AROUND THE YEAR 2,000: In January of 2022, Pope Francis made it official: Over 1800 years after his death, St. Irenaeus is officially a Doctor of the Church. St. Irenaeus was a student of St. Polycarp, who was a student of St. John the Apostle. St. John wrote the book of Revelation and was a disciple of Jesus Christ. Irenaeus, along with Saints Peter, Paul and John taught in their writings that with the "Lord one day is 1,000 years and 1,000 years is as one day."