When a mind dies?

The mind dies, being constantly fixed on his own self. Thence follows the cessation of desires. Therefore do away with your superimposition.

This death of the mind does not mean loss of the mind, but perfect purification, in which stat it is identified with the Atman. When one knows one self as the Atman, there is no longer a mind needing control.

In seeking to control of our mind we must aspire to this absolute state of being. As long as we have more desires than on, or other desire then desire for the realization of Atman, it will be difficult to control the mind, for it will then be in a scattered state. It we seek anything less then the highest, into which everything converges, as it were, the mind will be divided. It is hard to control a divided mind. In other words, those who seek anything less then perfect illumination, or realization of the self, can never control their mind perfectly. They have some desire other then that that for illuminations and therefore they in effect vote for the perpetuation. Thus they render them selves incapable of doing things needed for controlling the mind. Of these disciplines one particularly is very helpful in controlling the mind through it power of purification.