When you have seen [the mind's] consciousness, you find it is neither out nor in: without hurry, objectively & calmly observe it. When you master this, then melt and flux over and over, empty yet solid, profoundly stable, and then the flowing consciousness will disappear.
Those who get this consciousness to disappear will then destroy the obstructing confusions of the Bodhisattvas of the ten stages. Once this consciousness is gone, then the mind is open and still, quiet, serene and calm, perfectly pure, and enormously stable.
I can't speak about it any further. If you want to attain it, take up the chapter in the Nirvana Sutra on the indestructible body, and the chapter in the Vimalakirti sutra on seeing the Immovable Budha: contemplate and reflect on them without hurry, search them carefully and read them thoroughly. If you are totaly familiar with these sutras and can actually maintain this mind in whatever you are doing - even in the face of the five desires and eight winds - then your pure conduct will be set firmly and your task will be complete; in the end you will no longer be subjected to a body that is born and dies.