One can think of a secretary actively operating a filing system, of a librarian actively cataloguing books, of a computer actively sorting out information. The mind however does not actively sort out information. The information sorts itself out and organises itself into patterns. The mind is passive. The mind only provides an opportunity for the information to behave in this way. The mind provides a special environment in which information can become self-organising. This special environment is a memory surface with special characteristics.
The commercial media are to the mental environment what factories are to the physical environment
We begin to see, therefore, the importance of selecting our environment with the greatest of care, because environment is the mental feeding ground out of which the food that goes into our minds is extracted.
If I think the environment in the world needs to be cleaned up, let me clean up my own environment. Let me clean up the environment in my head - let me work with that pollution and that ecosystem.
Our mental environment is a common-property resource like the air or the water. We need to protect ourselves from unwanted incursions into it, much the same way we lobbied for non-smoking areas ten years ago.
A mind, like a home, is furnished by its owner, so if one's life is cold and bare he can blame none but himself. You have a chance to select from pretty elegant furnishings.
I believe your atmosphere and your surroundings create a mind state for you.