“Seth material” search engine (Jane Roberts)

You may consider a mental enclosure in its simplest terms to be somewhat like a cube. The dimensions may vary within, but the furthest side will be represented as open or transparent, the line itself being drawn only for convenience’s sake.

The dimensions of such mental enclosures are governed by the particular ability of the particular consciousness to receive, withstand and utilize energy. This ability is more or less elastic; that is, the ability can expand, and no rigid rules apply to it in a limiting manner.

It is the ability of such a unit of consciousness to utilize or create other forms and dimensions of itself that regulates the dimensions of the mental enclosure and of the effective self. You understand that about this mental or psychic enclosure the other elements of self are constructed, the physical image and its extensions into physical environment. This process, in various fields, continually goes on.