Just came across this expression from
NY Times http://www.nytimes.com/2009/07/05/business/05corner.html?_r=1&8dpc

It’s all about setting a goal that’s at the right intersection of ambitious and feasible

Is there any ellipsis? Can we use adjectives after prepositions?

It's playing with language a bit.

As we can say "the rich" or "the young" to mean "people who are rich" or "people who are young" this is using the words "ambitious" and "feasible" to mean "goals that are amitious" and "goals that are feasible." The writer plays with a bit more, calling to mind two streets - one has ambitios goals, one has feasible, and where they cross is the right place to set your goal.
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Thank you for your quick and clear response. Here is another one in the same article:

There was so much good momentum and we were asking all sorts of good questions and launching new, good ideas. But ultimately, they took away resources and energy from the fundamental core of what we do, which we came back to believing was the most powerful thing. The obsession with truly staying focused on our core mission, I think, came from that. 

Does we came back to believing equates to I believe? Do I need to enclose it with commas if I were to write a similiar sentence?

Hope this wont be too much trobule, thank you again!!
I recently read a novel, historical fiction, that had as its title a clever play with words that seems to fit in this thread: Hotel On the Corner of Bitter and Sweet.
That is a great title, Philip!

Returned to a previously held belief that...
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