Spiritual evolution

Philosophers that have posited theories of spiritual evolution include: Schelling, Hegel, Aurobindo, Jean Gebser, Pierre Teilhard de Chardin, Clare W. Graves, and Ken Wilber. These theories tend to be non-materialistic, and thus out of the intellectual mainstream. They can be idealistic (holding that reality is primarily mental or spiritual) or non-dual (holding that there is no ultimate distinction between mental and physical reality). The basic idea is that reality consists of several realms, including more than one of the following: the physical, the vital, the subtle, (or mental or psychic, after the Greek psyche, "soul"), the causal (referring to "that which causes the manifest world"), and spiritual or ultimate.