This is from the book titled: Idea and Ideology. There are 11 chapters to the book, and this is the reading of the 5th chapter titled - Kosa.
Baba explains how consciousness expresses itself through layers of mind, from the crudest physical experience to the subtlest causal awareness. Baba describes five kośas—kámamaya, manomaya, atimánasa, vijiṋánamaya, and hirańmaya—which represent increasing levels of subtlety in how the mind interacts with the world. Our perceptions depend on the health and coordination of the senses, nerves, mind, and ego, and errors in any of these lead to distorted understanding. Through sádhaná, the unit mind gradually transcends the crude and subtle layers, realizing that its causal mind is not separate from the Cosmic Mind. Ultimately, this teaching shows that individual consciousness and Cosmic Consciousness are not different in essence—only in degree of expression.
The following link is a chart of the Kosas and Lokas:
https://sureshemre.wordpress.com/2012/01/07/layers-of-the-mind-kosha-and-loka/
