I speak only english. Author of this poll and another one asking the number of languages one speaks, 1 to 5 or so
I agree with the quote in that communicatively speaking (no pun, and i mean in terms of us being such a communicative species) we find a barrier at language.
But not all the time, like in math etc...
So his quote has it's purpose, but it's nothing better than a quote from eminem, heh