Delusions will not arise

"The key to cultivating the Way is knowing that your own mind is originally pure, that it is neither created nor destroyed, and that it is free of discrimination. The mind whose nature is perfectly pure is your true teacher and superior to any of the buddhas of the ten directions you might call upon.

And how do you know your mind is originally pure? The shastras say "Within the body of every being is their admantine buddha nature. Like the sun, it fills the world with its perfect light. But because it's covered by the dark clouds of the five Skandhas [Form, Sensation, Perception, Memory and Consciousness], it can't shine forth, like a lamp inside a jar." For example, when the clouds and mists of the world arise in every direction and turn the sky dark, does the sun stop shining? The reason there's no light isn't that the light has been destroyed but that it's been covered up by clouds and mist. The pure mind of every being is like this. It's just obstructed by the dark clouds of attachment, delusion, and affliction. If you can concentrate on guarding the mind, delusions will no longer arise, and the reality of nirvana will spontaneously appear. Thus you should know that your mind is originally pure."

Hongren, the fifth zen patriarch. Discourse on the supreme vehicle.

Ghosts in Zhongnanhai

"He said once Zhou Enlai invited Empty Cloud to Beijing. He said, "Nobody knows about this. I've never told anyone. Zhou Enlai sent word that the Old Master was to come alone and not to bring with him anyone except his attendant. When Zhou Enlai heard that Xuyun [Empty Cloud] was coming, he was very happy and was looking forward to their meeting. But when the Old Master was ushered into his office, the premier became very upset. You don't know about this. Nobody knows about this. Premier Zhou said, 'I told you not to bring anyone, to come alone. Why did you bring all these people with you?' Hundreds of people have suddenly appeared in the room. Xuyun said, 'I did not bring anyone. All the people you see here with me are people who have died. They're all ghosts.' Then suddenly they disappeared. Premier Zhou was terrified. After that, he issued orders to protect all the temples where the Old Master had lived. He thought Xuyun was a boddhisttava."

Bill Porter, Zen Baggage.