Not because of the promises, but because of the strength of the prayers, we prayed them in voice chat each night for three years. A bunch of us from around the world almost, couldn't sleep, we all met in a chat room, and would spend our nights praying together.
It was a crazy awesome time in my life, and though we don't chat as much now, we are definitely family. I do prefer sleep to no sleep, c-paps work wonders. But, at the same time, God used our humble offering of prayer for so many souls. The St. Bridget prayers were a big part of it.

Anyway, in those three years times we saw amazing miracles occur for people that we prayed them for.