Don't compete with mice.

Once, a weasel challenged a lion to a duel. The lion decisively refused. "What?" said the weasel, "Are you afraid?" "Very afraid," said the lion, "If I accept, you will gain the honor of having fought a lion, while what about me? All the animals will laugh at me for fighting a weasel."

An American young writer, in his early years, created many popular and well-selling works, receiving much praise from readers. One day, the writer had a conflict with a local shrew over trivial matters, and neither was willing to back down—they started a tug-of-war. Friends advised the writer not to argue with the shrew, because the writer's time was precious, and he should spend more time on writing. But the writer couldn't let it go; he felt the shrew had damaged his reputation and insulted his character, and he wanted to defeat him, to make him sincerely submit. From then on, the writer and this "enemy" were at odds, and conflicts and friction constantly arose between them. The writer lost his motivation to write and never produced any satisfactory works. Years later, many people have forgotten that such a writer ever existed.

Lesson: The higher a person's goals, the faster their talents develop, and the more beneficial they are to society—this is a truth.