This concept was developed by both C.W. Leadbeater and Alice Bailey beginning in the 1920s. According to C.W. Leadbeater, Initiation is a process by which "we try to develop ourselves not that we may become great and wise, but that we may have the power and knowledge to work for humanity to the best effect." According to Alice Bailey, Initiation is the "process of undergoing an expansion [toward higher levels] of consciousness" It is believed by Theosophists that all souls that have reached the fourth level of initiation and evolved beyond the necessity to reincarnate. Those who do not elect to become pratyeka buddhas and go directly into Spiritual Hierarchy governing nirvana, gradually evolving upward through all of these six higher levels of consciousness over thousands or millions of years, and later over billions or trillions of years, with other higher levels beyond. The concept of Initiation is also recognized in the Ascended Master Teachings, a group of religions based on Theosophy. In the Ascended Master Teachings, the Sixth Initiation is referred to as Ascension. The first six initiations were named by Charles W. Leadbeater and Alice Bailey after the six most important events in the life of Jesus The Ascension is believed to be the returning to complete "Oneness with God" - "raising the outer atomic structure of the physical, emotional, and mental bodies into the Electronic Structure of the I AM Consciousness", becoming an Ascended Master, eventually a Cosmic Being, and beyond. The Ascension into Immortality through reunion with the God Self requires the consuming of at least 51% of the records and memories of "negatively qualified karma" as well as: Mastery of the matter planes It is believed that the "Individualized Flames of Perfection", emanating as lifestreams taking physical embodiment, can develop further attributes that express a unique Identity, and attain the fullness of the use of Light. This is done by mastery over matter planes that have a slower vibratory action, thus requiring more energy and concentration to externalize form. This allows for the development of greater skills of creation and "Causal Body Momentums" of various "Divine Qualities". Physical embodiment gives each individual the opportunity to expand these attributes and faculties through matter substance, and to become a "master of energy" through thought and feeling. This allows for accomplishments and added power which one who does not ever embody on a planet does not possess. Thus