Soulmate

Soulmate theory:
One theory of soulmates, presented by Aristophanes in Plato's Symposium, is that humans originally consisted of four arms, four legs, and a single head made of two faces, but Zeus feared their power and split them all in half, condemning them to spend their lives searching for the other half to complete them.

Some people believe that souls are literally made and/or fated to be the mates of each other, or to play certain other important roles in each other's lives.

According to theories popularized by Theosophy and in a modified form by Edgar Cayce, God created androgynous souls, equally male and female. The souls split into separate genders later, perhaps because they incurred karma while playing around on the Earth, or "separation from God". Over countless reincarnations, each half seeks the other. When all karmic debt is purged, the two will fuse back together and return to the ultimate.

Egyptian soul:
The Ancient Egyptians believed that a human soul was made up of five parts: the Ren, the Ba, the Ka, the Sheut, and the Ib. In addition to these components of the soul there was the human body (called the ha, occasionally a plural haw, meaning approximately sum of bodily parts).

Ib (heart)
The most important part of the Egyptian soul was thought to be the Ib (jb), or heart. To Ancient Egyptians, it was the heart and not the brain that was the seat of emotion and thought, including the will and intentions. In Egyptian religion, the heart was the key to the afterlife. It was conceived as proceeding at death to the future world, where it gave evidence for, or against, its possessor. It was thought that the heart was examined by Anubis and the deities during the Weighing of the Heart ceremony. If the heart weighed more than the feather of Maat, it was immediately consumed by the demon Ammit.

Sheut (shadow)
A person's shadow, Sheut (šwt in Egyptian), was always present. It was believed that a person could not exist without a shadow, nor a shadow without a person, therefore, Egyptians surmised that a shadow contained something of the person it represents. For this reason statues of people and deities were sometimes referred to as their shadows.

The shadow was represented graphically as a small human figure painted completely black as well, as a figure of death, or servant of Anubis.

Ren (name)
As a part of the soul, a person's ren (rn 'name') was given to them at birth and the Egyptians believed that it would live for as long as that name was spoken, which explains why efforts were made to protect it and the practice of placing it in numerous writings. For example, part of the Book of Breathings, a derivative of the Book of the Dead, was a means to ensure the survival of the name. A cartouche (magical rope) often was used to surround the name and protect it. Conversely, the names of deceased enemies of the state, such as Akhenaten, were hacked out of monuments in a form of damnatio memoriae. Sometimes, however, they were removed in order to make room for the economical insertion of the name of a successor, without having to build another monument. The greater the number of places a name was used, the greater the possibility it would survive to be read and spoken.

Ba (individual personality)
The 'Ba' (b3) is in some regards the closest to the contemporary Western religious notion of a soul, but it also was everything that makes an individual unique, similar to the notion of 'personality'. (In this sense, inanimate objects could also have a 'Ba', a unique character, and indeed Old Kingdom pyramids often were called the 'Ba' of their owner). Like a soul, the 'Ba' is a part of a person that the Egyptians believed would live after the body died, and it is sometimes depicted as a human-headed bird flying out of the tomb to join with the 'Ka' in the afterlife.

The word 'bau' (plural of the word ba) is based on this concept. It meant something similar to 'impressiveness', 'power', and 'reputation', particularly of a deity. When a deity intervened in human affairs, it was said that the 'Bau' of the deity were at work [Borghouts 1982]. In this regard, the ruler was regarded as a 'Ba' of a deity, or one deity was believed to be the 'Ba' of another.

Ka (life force)
The Ka (k3) was the Egyptian concept of life force, that which distinguishes the difference between a living and a dead person, with death occurring when the ka left the body. The Egyptians believed that Khnum created the bodies of children on a potter's wheel and inserted them into women's bodies. Depending on the region, Egyptians believed that Heket or Meskhenet was the creator of each person's Ka, breathing it into them at the instant of their birth as the part of their soul that made them be alive. This resembles the concept of spirit in other religions.

The Egyptians also believed that the ka was sustained through food and drink. For this reason food and drink offerings were presented to the dead, although it was the kau (k3w) within the offerings (also known as kau) that was consumed, not the physical aspect. The ka was often represented in Egyptian iconography as a second image of the individual, leading earlier works to attempt to translate ka as double.

Akh
The Akh (3ḫ meaning 'effective one'), was a concept that varied over the long history of ancient Egyptian belief. It is besides Ka and Ba one of the central elements, aspects of immortal personality, even after the death of the physical body. In this sense, it was a sort of ghost.

In later belief, the Ka was considered to change into the Akh and Ba after death, rather than uniting with the Ba to become the Akh. At this stage, it was believed that the Akh spent some time dwelling in the underworld before returning and being reincarnated as a Ka, gaining a new Ba.

The separation of Akh and the unification of Ka and Ba were brought about after death by having the proper offerings made and knowing the proper, efficacious spell, but there was an attendant risk of dying again. Egyptian funerary literature (such as the Coffin Texts and the Book of the Dead) were intended to aid the deceased in "not dying a second time" and becoming an akh.