The Theosophical Society which draws much of its inspiration from India, was the first institution in modern times responsible for widely spreading the concept of reincarnation in the West. It has taken reincarnation, as well as karma and spiritual evolution, as one of its cardinal tenets; it is, according to a recent theosophical writer, "the master-key to modern problems," including heredity.

In the Theosophical world-view, the soul in man is originally pure, but it lacks self-consciousness and its powers are potential. Reincarnation is the vast rhythmic process by which the soul in man unfolds its spiritual powers in the world of form and gets to know itself.

First, the soul descends from its sublime, free, spiritual realms, to inhabit a baby form. While living in a human form, it gathers experience through its effort to express itself in the world. After the lifetime is over, there is a withdrawal from the physical plane to successively higher levels of Reality, in what we call death. It involves a process of purification and assimilation of the wisdom from its past life experience.

Finally, having completely withdrawn and cast off all instruments of personal experience, it stands again in its spiritual and formless nature. After that process is finished, the soul is ready to begin its next rhythmic manifestation and to descend into matter in a new effort to unfold its spiritual nature and to gain consciousness of its divine origin and nature.

From such a view point, which covers vast periods of time, what is called a lifetime is as a day in the life of the true spiritual human being. This spiritual entity moves forward on a vast pilgrimage, every lifetime bringing it closer to complete self-knowledge and self-expression.

According to Theosophy, then, that which reincarnates is the part of man which belongs to the formless non-material and timeless worlds. It is neither the physical body and all of its characteristics, nor the emotional nature, with all its personal likes and dislikes, nor the mental nature, with its accumulated knowledge and its habits of thinking, that will reincarnate. That which is above all these aspects is that which reincarnates.

However, when the formless essence of a human being begins its process of reincarnation, it attracts the old mental, emotional, and energetic karmic patterns to form the new personality. Thus the soul with the added powers developed during its previous lives and the post-mortem process of assimilation, deals with the old hindrances or shortcomings it was not able to work out in its previous lifetimes.