What does krylov's fable Frog and Bull tell us?

This essay is also very interesting. Frogs live with old cows. Although the frog is small, it is envied by the ancient cow. I want to surpass the size of ancient cattle. It's a hard smoke. Pregnant. But no matter what you do, you can't compare with the ancient cattle people. Finally, I burst my stomach because I pushed too hard. Tell us that we should also recognize the facts and not bite off more than one can chew.