Principle or Exposition of the Divine Principle (Korean 원리강론/原理講論, translit. ) is the main theological textbook of the Unification movement. It was co-written by Moon and early disciple Hyo Won Eu and first published in 1966. A translation entitled Divine Principle was published in English in 1973. The book lays out the core of Unification theology, and is held to have the status of scripture by believers. Following the format of systematic theology, it includes (1) God's purpose in creating human beings, (2) the fall of man, and (3) restoration – the process through history by which God is working to remove the ill effects of the fall and restore humanity back to the relationship and position that God originally intended. God is viewed as the creator, whose nature combines both masculinity and femininity, and is the source of all truth, beauty, and goodness. Human beings and the universe reflect God's personality, nature, and purpose. "Give-and-take action" (reciprocal interaction) and "subject and object position" (initiator and responder) are "key interpretive concepts", and the self is designed to be God's object. The purpose of human existence is to return joy to God. The "four-position foundation" (Origin, Subject, Object and Union) is another important and interpretive concept, and explains in part the emphasis on the family. Second marriage and blessing ceremonies Marriage to Hak Ja Han Moon married his second wife, Hak Ja Han who was 17 at the time, on 11 April 1960, soon after Moon turned 40 years old, in a ceremony called the Holy Marriage. Han is called "Mother" or "True Mother". She and Moon together are referred to as the "True Parents" by members of the Unification Church and their family as the "True Family". Jesus was divine but not God; he was supposed to be the second Adam who would create a perfect family by joining with the ideal wife and creating a pure family that would have begun humanity's liberation from its sinful condition. When Jesus was crucified before marrying, he redeemed mankind spiritually but not physically. That task was left to the "True Parents" – Moon and Han – who would link married couples and their families to God. Blessing ceremonies Blessing ceremonies have attracted attention in the press and in the public imagination, often being labeled "mass weddings". Some couples are already married and those that are engaged are later legally married according to