What is dangerous is the human heart. When they learn something, they want to use it to seek fame and other things that are beneficial to them.
Of course it will be sent by heaven!
For a simple example, after learning Feng Shui (really learning the essence), use Feng Shui to adjust a person's fortune, and then this person will get wealth that he shouldn't have, but you must know that fortune will not be made out of nothing, and if he gets it, you will have to make up for it, and there will be losses. You will only lose more than he gains (of course, it's okay if he has a big reward, provided you can watch it). )
So in my opinion, nothing can be used for personal gain. If it is used for altruism, it is ok, but it can only be done with the trend. Just like giving a beggar in the street, it's okay to give dozens of dollars. If you give it several W's, it will not only help him, but also hurt him.
There are too many causes and effects, which need to be carefully understood.