青蛙和牛

An ox, grazing in a swampy（沼泽的） meadow, chanced to set his foot among a parcel of young frogs, and crushed nearly the whole brood to death.

One that escaped ran off to his mother with the dreadful news. "Oh, mother!" said he ,"It was a beast - such a big four footed beast! That did it." "Big?" quoth the old frog, "How big? Was it as big" -- and she puffed herself out to a great degree- "as big as this?" "Oh!" said the little one, "a great deal bigger than that." "well, was it so big?" and she swelled herself out yet mere. "Indeed, mother, but it was, and of you were to burst yourself you would never reach half its size." Provoked at such a disparagement of her powers, the old frog made one more trial, and burst herself indeed.

So men are ruined by attempting greatness to which they have no claim.