P231:1, 20:8.1 The Paradise Spiritual Sons are unique Trinity-origin beings and the only Trinity creatures to be so completely associated with the conduct of the dual-origin universes. They are affectionately devoted to the educational ministry to mortal creatures and the lower orders of spiritual beings. They begin their labors in the local systems and, in accordance with experience and achievement, are advanced inward through the constellation service to the highest work of the local creation. Upon certification they may become spiritual ambassadors representing the local universes of their service.
P231:2, 20:8.2 The exact number of Teacher Sons in Nebadon I do not know; there are many thousands of them. Many of the heads of departments in the Melchizedek schools belong to this order, while the combined staff of the regularly constituted University of Salvington embraces over one hundred thousand including these Sons. Large numbers are stationed on the various morontia-training worlds, but they are not wholly occupied with the spiritual and intellectual advancement of mortal creatures; they are equally concerned with the instruction of seraphic beings and other natives of the local creations. Many of their assistants are drawn from the ranks of the creature-trinitized beings.
P231:3, 20:8.3 The Teacher Sons compose the faculties who administer all examinations and conduct all tests for the qualification and certification of all subordinate phases of universe service, from the duties of outpost sentinels to those of star students. They conduct an agelong course of training, ranging from the planetary courses up to the high College of Wisdom located on Salvington. Recognition indicative of effort and attainment is granted to all, ascending mortal or ambitious cherubim, who complete these adventures in wisdom and truth.
P231:4, 20:8.4 In all universes all the Sons of God are beholden to these ever-faithful and universally efficient Trinity Teacher Sons. They are the exalted teachers of all spirit personalities, even the tried and true teachers of the Sons of God themselves. But of the endless details of the duties and functions of the Teacher Sons I can hardly instruct you. The vast domain of Daynal-sonship activities will be better understood on Urantia when you are more advanced in intelligence, and after the spiritual isolation of your planet has been terminated.