The Soul and Its Purpose pg.70-73

The soul originates from the spiritual worlds of God. It is exalted above matter and the physical kingdom. The individual comes into being when the soul, emanating from these spiritual worlds, becomes associated with the embryo before birth. But this association is far above material relationship such as egress or regress, entry or exit, since the soul does not belong to the world of matter. The relationship is like that of light to a mirror. The light which appears in the mirror is not inside it. The radiance comes from a source outside. Similarly, the soul is not within the body. It has a special relationship to the body and together they form the human being. But this relationship lasts only for the duration of mortal life. When that ceases, each returns to its origin, the body to the world of dust and the soul to the spiritual worlds of God. Having emanated from the spiritual realms to become an individual being created in the image and likeness of God, and capable of acquiring divine qualities and heavenly attributes, the soul will, after its separation from the body, progress for all eternity.
But the condition of the soul after death depends upon the extent to which it has acquired divine virtues in this life. If a child is born without a limb, he will never acquire it after birth and will remain handicapped as long as he lives. Similarly, the soul, if it does not turn to God in this life to become illumined with His guidance, will, though progressing, remain relatively deprived and in darkness.
The soul can take with it only good qualities to the next world. It cannot take bad ones. For bad is only the absence of good, as poverty is the absence of riches. Therefore, an evil person is a soul poor in divine virtues. He carries with him only a small measure of heavenly qualities. But a man who has led a virtuous life in this world carries a much greater measure. Through the bounty of God, however, both these souls will progress, but each on its own level.
In the next life, according to the Teachings of Bahá’u’lláh, there are different degrees of existence and, as in this life, those on lower levels will not be able to comprehend the attributes and qualities of the souls which dwell in higher realms.
The highest station destined for man is to be illumined by the ‘spirit of faith’, which comes through recognition of the Manifestation of God for the age and through obedience to His commandments. To attain this station is the very purpose for which God created man.
-Adib Taherzadeh
This explaination here or in the book “Some Answered Questions” by Abdu’l-Baha about the essence of the soul is why I became a Baha’i, it spoke to me and made things appear more clear than anything I have ever read about this subject.