Though man descends from on high into these lower worlds, it is only through that descent that a full cognizance of the higher worlds is developed in him.

Full consciousness in any given world involves the power to perceive and respond to all the undulations of that world: therefore the ordinary man has not yet perfect consciousness at any level--not even in this physical world which he thinks he knows.

It is possible for him to unfold his percipience in all these worlds, and it is by means of such developed consciousness that we observe all these facts which I am now describing.
The causal body is the permanent vehicle of the ego in the higher mental world.

It consists of matter of the first, second and third subdivisions of that world.

In ordinary people it is not yet fully active, only that matter which belongs to the third subdivision being vivified.