Why is there a saying that it is easier to ask God than to send him away?

"It is easier to ask God than to send him" generally means that you want to borrow some evil forces to help you accomplish something. When you finish this, you will find that those evil forces depend on you and cannot get rid of them. In fact, I have heard such a story, which was told by a priest there. Although it is somewhat mysterious, I feel that this story can also explain the sentence "It is easier to ask God than to send him" relatively perfectly.

It is about a village where a woman is petty and often quarrels with relatives and friends. She was sulking after the quarrel. Once, a woman quarreled with her sister-in-law, and she was very angry when she came home. Then she had a brainwave, bought roast chicken and some snacks, went to a chaotic grave behind the village, knelt down and ate all the food. After a while, she saw that nothing had happened and went home. When she got home, she was about to enter the house when she heard someone calling her name. She looked down and found it was a hedgehog. It turned out to be a hedgehog and a fairy. She invited me home.

So the woman was ecstatic. Invite Daxian Hedgehog to her house quickly. Hedgehog asked her what she wanted. She said that her sister-in-law bullied her and wanted Daxian the Hedgehog to give her some color to see see. The hedgehog fairy said, OK, it's my treat. Then the big fairy hedgehog disappeared. A few days later, the woman received the news that her sister-in-law was killed by a car. When she first heard it, she was shocked. She thought her curse had caused her sister-in-law's death, so she found the hedgehog again and let him go out. The result is definitely not leaving! So this woman slowly became insane.