Nirvikalpa samadhi is another matter. I don't feel that's really up to us. That happens at a certain time when our being has gone through countless changes and refinements.
Frederick LenzThe only problem that occurs in the practice of tantra is when you don't practice tantra and fool yourself. You get caught up in powerful vortexes of negative energy which pull you into the lower bardo regions ... into the mud.
Frederick LenzNirvana and enlightenment exist just on the other side of your sensory perceptions and your thoughts.
Frederick Lenz