"Human beings undergo psychological development. At each level or stage of development, they will see the world in a different way. Hence, each level of development has, as it were, a different religious belief or worldview. This does not make God or Spirit the result of human development; it does, however, make the ways in which humans conceive of God or Spirit the result of development. And this is where it gets really interesting."
— Ken Wilber, "Which Level of God Do You Believe In?" (Beliefnet Essay 3)
In his essay entitled "Which Level of God Do You Believe In?", Ken Wilber shares some of his thoughts on the process of psychospiritual growth and provides a summary of the model created by the consciousness theorist Jean Gebser, which proposes five distinct levels of development: an archaic spirituality, a magic spirituality, a mythic spirituality, a mental spirituality, and an integral spirituality.