Each human being is born with a dominant lower centre, called the dominant brain.
We meet only the three lower categories (man number 1, 2, and 3) in ordinary life; higher categories (man number 4, 5, 6, and 7) can be reached only through work on oneself.
Man number 4 = balanced man (only possible normally as result of school work and school culture), has balanced centres and permanent centre of gravity (idea of acquiring unity, consciousness, permanent I, and will has become more important than all other interests), has valuation of the work, and values his relation to the school; begins to know himself and whither he is going, can lose everything. Man number 4 requires a certain number of men number 1, 2, and 3 to work with in order to develop.
Man number 5 has already crystallized essence, has higher emotional centre operating (has self-consciousness), has one indivisible permanent I and all his knowledge belongs to this I (has unity), has many extra functions and powers, can be the result of right work (becomes man number 5 from man number 4, can then become man number 6 and man number 7) or of wrong work (becomes man number 5 without having been man number 4, cannot develop further, cannot become man number 6 and man number 7), can lose everything. Man number 5 requires a certain number of men number 4 to work with in order to develop.
Man number 6 has all qualities of man number 5 with addition of higher intellectual centre operating, (has objective consciousness), has many more new faculties and powers, virtually superhuman, can lose everything. Man number 6 requires a certain number of men number 5 to work with in order to develop.
Man number 7 has all qualities of man number 6 with addition of both higher centres crystallized correctly, has permanent I and free will, can control all states of consciousness in himself, immortal within limits of solar system, superhuman, cannot lose anything he has acquired. Man number 7 requires a certain number of men number 6 to work with in order to develop. The presence of a man number 7 on the Earth indicates that all life is controlled by schools.