The mind is a formless continuum that functions to perceive and understand objects.
Some people think that the mind is the brain or some other part or function of the body, but this is incorrect. The brain is a physical object that can be seen with the eyes and that can be photographed or operated on in surgery. The mind, on the other hand, is not a physical object. It cannot be seen with the eyes, nor can it be photographed or repaired by surgery. The brain therefore is not the mind but simply part of the body.
Because the mind is formless, or non-physical, by nature, it is not obstructed by physical objects. Thus, it is impossible for our body to go to the moon without travelling in a spaceship, but our mind can reach the moon in an instant just by thinking about it. Knowing and perceiving objects is the uncommon function of the mind. Although we say, “I know such and such”, in reality it is our mind that knows. We know things only by using our mind.
Our Body and Mind Are Different Entities
There is nothing within the body that can be identified as being our mind because our body and mind are different entities. For example, sometimes when our body is relaxed and immobile, our mind can be very busy, darting from one object to another. This indicates that our body and mind are not the same entity.
The Levels Of Mind
It is the very subtle mind that will eventually transform into the omniscient mind of a Buddha.
There are three levels of mind: gross, subtle, and very subtle. Gross minds include sense awarenesses such as eye awareness and ear awareness, and all strong delusions such as anger, jealousy, attachment, and strong self-grasping ignorance. These gross minds are related to gross inner winds and are relatively easy to recognize. When we fall asleep or die, our gross minds dissolve inwards and our subtle minds become manifest.
Subtle minds are related to subtle inner winds and are more difficult to recognize than gross minds. During deep sleep, and at the end of the death process, the inner winds dissolve into the center of the heart channel wheel inside the central channel, and then the very subtle mind, the mind of clear light, becomes manifest.
The very subtle mind is related to the very subtle inner wind and is extremely difficult to recognize. The continuum of the very subtle mind has no beginning and no end. It is this mind that goes from one life to the next, and, if it is completely purified by training in meditation, it is this mind that will eventually transform into the omniscient mind of a Buddha.