I have some Q's from Autobiography of a Yogi.
1) What is difference between Soul and Astral body?
2) In the books he says that in the Astral planes the astral beings Who have overcome physical karma and live permanently in the astral planes, reincarnate again an again to overcome their astral karma until they move to the Causal plane. But how can a Soul die by itself and reincarnate in the same astral plane? Isn't reincarnation from astral to physical only? What rebirth here means?
—Raymond, South Africa
Paramhansa Yogananda taught that the soul is not the same as the astral body that encases it. In fact he taught, in line with the teachings of Sanaatan Dharma, that the soul, which is the pure reflection of Spirit, appears on the causal plane, not the astral plan
Thus the soul’s astral desires which encase and limit it allow for the astral body to exist and to still be required to work out those desires on the astral plane. When its sojourn upon the astral plane achieves its natural end, the astral body is shed and the soul rises for rest to the causal plane there to re-incarnate back to the astral plane if there still remain astral desires.
Once the soul has shed all physical and astral desires it ascends to the causal plane which is the bliss plane and at which the only remaining “desire” is the separateness of the pure Soul from Spirit. The soul can merge back to God easily from the casual plane.
I hope you will find this helpful.