The primordial illusion (Moola Maya) possesses shape and qualities, whereas Brahman is devoid of them. Qualities indicate unsteadiness, and bring illusion to the forefront. Unsteadiness is an inspiration (an arising movement), a mere concept. A concept means that it is only a thought. We forget our "Self" because we get engrossed and absorbed in thoughts.

We are steady by nature. Unsteadiness comes later, and then goes. We resemble the sea in this respect. The sea is inherently calm and quiet, but appears agitated due to waves. The sea represents Brahman, the steady, while the waves represent the illusion, which is unsteady.

The fourth body, the Supracausal body, is that "Consciousness" wherein you are conscious only of "I Am." Ignorance comes into existence when you are unaware of it. Pay close attention to Consciousness, and notice that everything is ignorance in the form of mind. The mind has limitations, whereas the Self is all pervading and boundless.

The individual (Jiva) is the one who is governed by the mind and who tries to understand everybody else’s mind. When you focus on the mind, all that you see is unsteadiness. This is called inaccurate vision (Vikalpa Drishti). At most, you could say that it is a perverted way of seeing. The subtle body(mind, intellect, thoughts, etc...) is full of inaccurate and perverted knowledge. This means that the activities of the mind as well as those of the intellect are unsteady and ever-changing. These ever-changing, unsteady activities, flow downwards into a relative inertia and take the form of the gross body.

"As the Self is in all beings, God exists in all." This should be our attitude. The Ultimate Truth resides in the fact that we are formless by nature.

Shri Siddharameshwar Maharaj - From a talk given March 18, 1933

The four bodies are 1) the physical, gross body, 2) the subtle body, 3) the causal body, and 4) the supracausal body.

For a detailed explanation of the Four Bodies refer to "Master Key to Self-Realization" written by Shri Siddharameshwar Maharaj found in the book "Amrut Laya"