To begin, two pieces with a similar meanings, different visuals. Hope you like them:
Harsh words hurled at a hard-headed man will for a moment gain his attention; but his ravings will go on.
Harsh words hurled at the guileless one will accomplish their full purpose, and a
crushing of the spirit along with it.
_ _ _ _ _
An anvil on the head of leviathon* turns him away from you;
but a mere hand strikes the moth, and it will never molest anyone again.
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* Crocodile.




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I like learning! In general, the meaning of "leviathon" is nonspecific, so that the term could apply to any such great sea monster or reptile. So you are correct. And, perhaps the poem maintains meaning with "whale" also!--though not quite as effectively as "crocodile," to me.



