If the wolf turns back, there must be a reason, either to repay the kindness or to take revenge. What does this sentence mean?

If the wolf leaves and comes back, there must be a moral reason. When the wolf comes back, he will either repay his kindness or take revenge. This sentence expresses the injustice of the wolf. For the help of others, the wolf will choose to repay, and the wolf is also an animal that bears grudges. If it is not hurt by others, the wolf will always remember and finally choose revenge.

In addition to the literal meaning, this sentence also expresses that everything is spiritual. If you are kind to others, others will be kind to you. Even if you are an animal, the harm you have done to others or animals will be retaliated, so you should be kind to others and things.

Extended data:

This sentence says that the wolf will repay the kindness. The story of the wolf's gratitude is as follows:

A hunter went hunting in the mountains and saw a wolf lying in the canyon. When he raised his shotgun to aim at the wolf, the wolf stood up and lay there instead of running. The hunter took a closer look and found that it was a pregnant female wolf, which looked a little pitiful. The wolf looked at the hunter as if begging him to spare her life. It turned out that the wolf had a broken leg.

The hunter was soft-hearted, not only did he not kill it, but also bandaged its broken leg. The cold winter came, and a heavy snow blocked the gate, making hunting in the mountains impossible for many days. One night, the hunter heard the backyard plop, as if someone had thrown something into the yard. The next day, when the hunter opened the door, he saw some rabbits and pheasants thrown in the yard.

This happens every time it snows heavily and you can't get out of the mountain. The hunter realized that the wolf had repaid his kindness.