A sad story about fish. What is the specific content of this story?

Story: The glass is in the heart. This is an experiment. There is a fish tank divided into two spaces by a piece of glass. There is a big fish on one side of the fish tank, which has not been fed for several days. Then, some small fish were put into the other half of the fish tank. When the big fish saw the small fish, it swam straight to the small fish. Unexpectedly, there was a layer of glass in the middle, so it was pushed back by the glass. The second time, it rushed to the small fish with all its strength, and the result was still the same, making it black and blue and miserable. If you fight again, you will pay a heavier price: you are not only scarred, but also have no courage to fight again. So the big fish chose to give up.

In this way, the hungry big fish watched the little fish swim around in the other half of the fish tank, but because of fear of the hard "wall", the big fish did not dare to make a move.

A few days later, the researchers pulled out the glass in the middle of the fish tank, and the small fish swam leisurely in front of the big fish, so free and unrestrained. Some small fish even practice handstands in front of big fish, but the hungry big fish still turn a blind eye. ...

Eat small fish, the big fish, was destroyed by that glass, and the big fish starved to death.

In our ordinary life, many people have an invisible "glass" in their hearts: the failure of first love makes many people begin to doubt the beauty of love; The lesson of falling head over heels made many timid people afraid to look up at the sky. ...

Maybe you are black and blue, but your heart must be complete. Don't let that "glass" confuse your eyes, let alone that "glass" sting your heart. In fact, if the big fish tries harder, it will easily eat the small fish. In this way, he will save himself and even become stronger. But it is precisely because that layer of "glass" has been taken away that it has given him the indicated harm. If you want to succeed, you should break the "glass" in your heart, clear this invisible obstacle, re-examine yourself, and try your best to succeed. Cheer up your life with a complete heart!