When I've seen it described by New Thought writers and their modern day followers, they don't say to only affirm it once. They advise "pray without ceasing." Keep on running that scene in its mind and most important its feeling of natural completion, over and over. It should be a short simple scene with one emotion, because the subconscious uses pictures. It doesn't respond to lots of words. This is all to change your own subconscious belief and faith. It's not about trying to use any outside consciousness or energy at all.