[Orgmode] Pull items from another file (by tag) and show them in another

[Marcelo de Moraes Serpa]

Hello list,

This might sound crazy, but here's what I'd like to do:

I have a reference.org file full of interesting notes I take during
the day. It even includes saying that I tag as mantras, such as this
one, from Paulo Coelho:  "Be the best, but get prepared to be
attacked. Only mediocrity is safe" ;)

I also have a horizons_of_focus.org (from GTD) a file I review every
week or so, and it has a list of MANTRAS I want to internalize. So,
when I capture a mantra, I just want it to go to my reference, but I
want to refer to it on horizons_of_focus. Is there a way (using babel
or some other crazy elisp) to pull entries tagged as <TAG> (in this
case :MANTRA:) and list them under a headline? This would be akin to a
custom view of data stored in other source (another org file).

Thanks,

Marcelo.