167:7.5
“Many of these angels are engaged in the work of saving men, for have I not told you of the seraphic joy when one soul elects to forsake sin and begin the search for God? I did even tell you of the joy in the presence of the angels of heaven over one sinner who repents, thereby indicating the existence of other and higher orders of celestial beings who are likewise concerned in the spiritual welfare and with the divine progress of mortal man.