At  the beginning of Catholicism in Korea, with the many difficulties  that the new religion encountered and with the lack of leaders, it is  surprising to learn that it was able to grow and spread throughout the  country as quickly as it did. One important reason why this happened was  given by the Peace Weekly, in its latest article in their series on  Catholicism and other religions, as it discussed the  relationship of 'Jeonggamrok' and Catholicism. 
Jeonggamrok, a book of prophecy, whose author and date of publication are unknown, is a mixture of divination, including geomancy, Chinese Philosophy and Taoism.  It has come down from the past in many versions, and has had many  followers, exerting an immense influence on the intelligentsia, who were  disillusioned with the ruling elite, as well as on the lower classes.  During the  last years of the  Jeosun Dynasty, the Jeonggamrok was studied and debated often by the  anti-establishment movement.
These prophecies also continued  to influence society at the end of the Jeoson Dynasty, during the  Japanese occupation, the independence movement, and into modern times.  There were  ten places in Korea, named in the prophetic writings, that were considered safe havens from  hunger and wars; and not a few people would  migrate to these areas, an indication of how influential the book had become.
 
Comparing the Jeonggamrok and  Catholicism, the Peace Weekly notes huge differences. Jeonggamrok is   fragmentary, non-systematic and desultory, and  yet it had a big influence on religion and politics, and prompted many  to band together in secret societies that often planned insurrections. 
During  the last years of the Joseon Dynasty, the Jeonggamrok  prophecies for the future began spreading throughout the country. At the  same time Catholicism was also reaching a wide audience so they  couldn't help  but influence each other. There are many within the  Church who see this mixing of two ways of seeing the future as helping  to spread Catholicism, even during the times of  persecution. When one remembers that Catholicism was an import from  outside the country, it helps to explain how it was able to put down  roots  so quickly in the  culture.
Why this book led to the acceptance of Catholicism in the country  is not difficult to understand. We know that for many years Catholicism had no  priests to lead the Christians. Their  introduction to Catholicism was  not systematically possible, and those that entered were helped  by the  hope that they found in the Jeonggamrok, even though much of this would  be contrary to Catholic teaching.
Also  helpful in the spread of Catholicism was the Nipokjeun, a book of  prophecies similar to the Jeonggamrok, that circulated among members of  the Catholic Church. Written in  1846, the book is believed to be the words of Yi Byok, John the Baptist, (1754-1785) who  appeared in a  dream to the author of the book. Yi Byok was a  leader in  the  early church, and in the book he explains the principles of creation,  why the first  parents were expelled from paradise, and the basic Catholic teaching. He  also points  out what he considers to be the errors of Buddhism,  Confucianism and Taoism; and  criticizes idolatry and the rites for parents, and directs us to  the  future world. The  writer concludes that  the Nipokjeun was  the Catholic Jeonggamrok.
 
 
   
 
