If you go to lisagerrard.com and look around the site, there is a mention of Lisa speaking with composer Ennio Morricone where he asks her about this piece and how she created it. She essentially tells him she doesn't know, as she is no academic; however, she drew on the pain of the death of her brother to inspire her to make that piece. It has some other information about her voice and how she creates other music. There is also a FAQ section where she will address the "meaning" of the "lyrics" (which are beautiful babble, essentially) but in conclusion, if the "lyrics" mean anything, it is a serendipitous accident.