Aesop's fable 伊索寓言
The lion and the mouse
A lion was awakened from sleep by a Mouse running over his face. Rising up in anger, he caught him and was about to kill him, when the Mouse piteously entreated (哀求), saying: "If you would only spare my life, I would be sure to repay your kindness." The Lion laughed and let him go.
It happened shortly after this that the Lion was caught by some hunters, who bound him by ropes to the ground. The Mouse, recognizing his roar, came up, and gnawed the rope with his teeth, and setting him free, exclaimed: "You ridiculed (取笑) the idea of my ever being able to help you, not expecting to receive from me any repayment of your favor; but now you know that, it is possible for even a Mouse to confer benefits on a Lion."
Don't belittle yourself. You can do a part to repay the favor that the community confers on you.