greg burke joins us by phone. adviser for communications at the vatican, and, greg, i tell you, by all accounts of course this is an unusual summit, certainly unprecedented with, again, jewish, christian and muslim prayers whisper in the shadows of st. peters basilica. if you could start, if you would, by talking about the significance of this occurrence. >> reporter: sure. no doubt about it. thanks. it's interesting. i read a great tweet today. somebody said, you know, i didn't pay any attention in the news for a week and all of a sudden you have the israelis and palestinians praying together at the vatican, whoa, so it is certainly unprecedented, and this is something that pope francis wanted to do on his holy land trip, and it was just too difficult in terms of pulling it all together in what was a very short trip, but that was just two weeks ago. he did manage. he launched the invitation there officially sunday two weeks ago, and two weeks later it's happened with a lot of work certainly on everybody's part. i