Some people get tired of continual perception of the finite universe. They feel the perception of the universe over and over in variant forms is kind of an unhappy condition, because it doesn't last.
Frederick LenzNirvana isn't a physical place. It is not like going to heaven. It just means no more individualized awareness, no aggregate body of experience.
Frederick LenzStart a meditation session by repeating a mantra, perhaps, "Aum", which is the most powerful of all mantras. Then, after repeating the mantra perhaps a dozen times, focus on a yantra.
Frederick Lenz