Earlier quoted context omitted.
> If you say "John is foo" you tend to create the impression that John will always and has always been foo. Interestingly in Spanish and Portuguese there are two verbs of "to be": "ser" and "estar". These have different meanings: ser ist mostly used for persistent states of being, while estar is mostly used for something that is only temporarily as it is, but could be different the next time.
Isn't that a bit like "is" vs. "is being"?
I'm not a native speaker of English, so I might not perceive some subtleties. But at least how I perceive it is the meaning of "is being" is similar "estar", while "to be" is used for both meanings in English. In Spanish and Portuguese (as far as I understand it, I'm still learning a lot) "ser" is used only for the "permanent" meaning.