On May 21, the Orthodox Church celebrates the Day of the Apostle and Evangelist John the Theologian.
The Apostle John the Theologian is a beloved disciple of Jesus Christ and the author of The Revelation of John the Theologian. The life of John the Evangelist quite naturally made him the patron of everyone who is related to books and book publishing.
In addition to writers, editors, publishers, book printers, book sellers and paper industry workers consider him their patron.
In addition, they believe that the prayer offered to the holy Apostle John the Theologian saves from poisoning, because the Apostle John himself, summoned to Rome by the emperor Domitian, took poison, which had no effect on him.
Every year, from the tomb of the holy Apostle John on this May day, fine dust came out, which the believers collected and healed them from illnesses. Therefore, the Church celebrates the memory of the holy Apostle John the Theologian on this day - May 21, according to the new style.