The psychic being is that which persists after death, because it is your eternal self; it is this that carries the consciousness forward from life to life.
The psychic being is the real individuality of the true and divine individual within you. For your individuality means your special mode of expression and your psychic being is a special aspect of the one Divine Consciousness that has taken shape in you. But in the psychic consciousness there is not that sense of division between the individual and the universal consciousness which affects the other parts of your nature. You are conscious there that your individuality is your own line of expression, but at the same time you know too that it is an expression objectifying the one universal consciousness. It is as though you had taken a portion out of yourself and put it in front of you and there were a mutual look and play of movement between the two. This duality was necessary in order to create and establish the objectivised relation and to enjoy it; but in your psychic being the separation that sharpens the duality is seen to be an illusion, an appearance and nothing more.
Is there a difference between the “spiritual” and the “psychic”? Are they different planes?
Yes, the psychic plane belongs to the personal manifestation; the psychic is that which is divine in you put out to be dynamic in the play. But when we speak of the spiritual we are thinking of something that is concentrated in the Divine rather than in the external manifestation. The spiritual plane is something static behind and above the outward play; it supports the instruments of the nature, but is not itself included or involved in the external manifestation here.
[The Mother: CWM 3]