We all walk that razors edge in consciousness between light and dark and good and evil, but that’s the path of the spiritual being. You have to put yourself on that vision of the infinite universe. On that very narrow path that your walking there is no support. There is no reference point except for the breath itself. You can use a mantra like sat nam, wahe guru or whatever you wish, but in essence it comes down to coordinating that mantra with your breath so its automatic, so you don’t lose your path because its so easy to slip off of it.