Why do fortune tellers and fortune tellers say that they can't tell others what they have calculated?

Why can't fortune tellers tell each other that they have worked it out?

First of all, the first reason is that if he says it, then things will not happen as he calculated the plot, but there will be another result, so the destiny cannot be violated, so he will not say it.

Another possibility is that when he is not afraid to say it, he is not close at all, so you won't believe it, so you won't give him a Q, so he chooses silence, which is more mysterious.

The third possibility is that the secret can't be leaked, and it won't be good for him if it is leaked. Every cause has its result, so it must happen. Even if he tells each other, it will not change anything, it will only make things worse. So when he tells everyone, he will get what he deserves, so he won't tell you.