What Aesop's fable is about being grateful?

Aesop's fable "The Lion and the Mouse" illustrates the theme of gratitude. In the story, a lion spares a tiny mouse, who later returns the favor by helping the lion escape from a hunter's net. This fable teaches that acts of kindness, no matter how small, can lead to unexpected rewards and emphasizes the importance of being grateful for the help we receive from others.