113:2.3

All angelic assignments are made from a group of volunteering seraphim, and these appointments are always in accordance with human needs and with regard to the status of the angelic pair—in the light of seraphic experience, skill, and wisdom. Only seraphim of long service, the more experienced and tested types, are assigned as destiny guards. Many guardians have gained much valuable experience on those worlds which are of the non-Adjuster fusion series. Like the Adjusters, the seraphim attend these beings for a single lifetime and then are liberated for new assignment. Many guardians on Urantia have had this previous practical experience on other worlds.