When it comes into contact with no object mind is like a vast, boundless void, or like a serene, illimitable ocean. When it encounters an object it at once has cognizance of it, like a mirror instantly reflecting a person who stands in front of it. The true nature of mind consists not only in taking clear cognizance of the object but also in communicating a concrete experience of that object to the one experiencing it.

There are in addition several other aspects and states of mind. In other words, taking mind as the supreme basis, there are many attributes related to it. Just as an onion consists of layer upon layer that can be peeled away, so does every sort of object have a number of layers; and this is no less true of the nature of mind as explained here; it, too, has layer within layer, slate within state.

All compounded things are subject to disintegration. Since experience and knowledge are impermanent and subject to disintegration, the mind, of which they are functions (nature), is not something that remains constant and eternal. From moment to moment it undergoes change and disintegration. This transience of mind is one aspect of its nature. However, as we have observed, its true nature has many aspects, including consciousness of concrete experience and cognizance of objects. Now let us make a further examination in order to grasp the meaning of the subtle essence of such a mind. Mind came into existence because of its own cause. To deny that the origination of mind is dependent on a cause, or to say that it is a designation given as a means of recognizing the nature of mind aggregates, is not correct. With our superficial observance, mind, which has concrete experience and clear cognizance as its nature, appears to be a powerful, independent, subjective, completely ruling entity.