Thank you Rene for posting.
5. V. Personality Realities (https://www.tmarchive.org/tub2/reader.php?paper=0§ion=5¶graph=0)
0.5.10 4. Soul. The Soul of man is an experiential acquisition. As a mortal creature chooses to “do the will of the Father in heaven,” so the indwelling spirit becomes the father of a new reality in human experience. The mortal and material mind is the mother of this same emerging reality. The substance of this new reality is neither material nor spiritual - it is morontia. This is the emerging and immortal Soul which is destined to survive mortal death and begin the Paradise ascension.
Love and Blessings,
Moses