As the real self (atman) remains unchanged throughout life, it likewise continues after death. This soul is carried within the subtle (astral) body to its next destination. The precise nature of the new body is determined by the state of mind at death and is specifically influenced by (1) the person's desires, and (2) his karma.
Samsara refers to the process of passing from one body to another
throughout all species of life. Hindus believe that consciousness is present
in all life forms, even fish and plants.
However,
though the soul is present in all species, its potential is exhibited to
different degrees. In aquatics and plants it is most "covered", practically
asleep, whereas in humans it is most alert. This progression of consciousness
is manifest throughout six broad "classes of life, "namely (1) aquatics,
(2) plants, (3) reptiles and insects, (4) birds, (5) animals and (6) humans,
including the residents of heaven. Most Hindus consider samsara
essentially painful, a cycle of four recurring problems: birth, disease,
old-age, and death.
Samsara: the perpetual cycle of repeated birth and death.
As the body wears clothes, the soul "wears" the body.
A story about reincarnation.
The time of death.
The Hindu rites of passage at death, during and after the funeral ceremony, are to ensure the peaceful passage of the soul. They aim to prevent the person being "held up" in his or her spiritual evolution, and particularly to avoid the possibility of remaining in subtle form as a ghost (as yet without a new body).
In fact, many Hindus consider all rites of passage as preparation for inevitable death.
"As the embodied soul continually passes in this body from boyhood to youth to old age, the soul similarly passes into a new body at death."
"Whatever state of being one remembers when he quits his body, 0 son of Kunti, that state he will attain without fail."
"The living entity, thus taking another gross body, obtains a certain type of ear, eye, tongue, nose and sense of touch, which are grouped about the mind. He thus enjoys a particular set of sense objects."
Bhagavad-gita 2.13, 8.06, 15.9
See also: Bhagavad-gita 2.22, 8.06, 15.8–10
Why are we not born with equal opportunity despite attempts to accomplish this through social reform?
The notion of a soul within all bodies is particularly relevant to the following issues:
No, the soul retains its identity, and the same "real-self" passes into a new body. Any differences between the body we now have and that which we receive in the next life reflect the subtle (psychological) changes undergone in this chapter of life.