Author Ruth Montgomery introduced the concept of “walk-ins” in her book Strangers Among Us followed by Threshold to Tomorrow. She wrote: “A Walk-in is a high-minded entity who” after numerous incarnations “is permitted to take over the body of another human being who wishes to depart.... The motivation for a Walk-in is humanitarian. He returns to physical being in order to help others help themselves, planting seed-concepts that will grow and flourish for the benefit of mankind.... The original occupants vacate the bodies because they no longer can maintain the physical spark of life or because they are so dispirited that they earnestly wish to leave.”
Pearls of Wisdom, vol. 31, no. 46, July 30, 1988.
- Ruth Montgomery, Strangers Among Us: Enlightened Beings from a World to Come (New York: Ballantine Books, Fawcett Crest Book, 1979), pp. 11, 12; Threshold to Tomorrow (New York: G. P. Putnam's Sons, 1982), p. 10.