"If you believe it, there will be, but if you don't, there will not."

There are many ghosts in Chinese culture. Ghosts have been believed and worshipped by Chinese for a few thousand years. Even Confucius said, "Respecting ghosts and gods, but away from them."

Many people believe ghosts, yet many don't. Chinese people often say, "If you believe it, there will be, but if you don't, there will not." Here is a story about this saying.

Zhuxi was a famous scholar in the Song Dynasty (960 - 1279). He believed there were no ghosts in the world, so he decided to write an essay "No Ghost." It was said he was a great sage so even ghosts were afraid of him. If he said no ghosts, ghosts could no longer exist. When ghosts knew he was writing the essay, they gathered together to discuss this and decided to send the smartest ghost to entreat him abandon the writing.

So one night, the smartest ghost appeared at Zhuxi's desk and kowtowed towards Zhuxi repeatedly.

The ghost told Zhuxi to abandon the writing to save them. Zhuxi laughed and said:

"You, the ghosts have been worshipped in the human world for so long. Isn't the time for you go away all together."

"We also have good and bad ghosts..."

"Well, I heard you can do anything. Can you move me to the outside?"
"Certainly, Sir."

Zhuxi was moved to the outside instantly without even noticing it. Zhuxi was astonished by the ability of ghosts, but was unwilling to say it. Then he asked again,

"You can move my body. Can you move my heart?"

"That is impossible to do, Sir.But we can move things or a person's body so that it proves we exist. We exist in illusion. If you believe it, there will be, but if you don't, there will not.
Can you say something like that in your essay, Sir?"

Zhuxi felt the words did have some merits so he promised the ghost he would do that. The ghost left happily. Therefore, Zhuxi wrote the words, under the title of the no ghost essay, "If you believe it, there will be, but if you don't, there will not."

from this link

More on Zhu Xi , I dig his principles. Go Mencius!