The 666 rundown

The significance is obviously 2/3. 2/3 is the ratio of the fifth interval in music, all those heavy metal bands used exclusively fifth chords or power chords, for the most part. 2/3 signifies mind and body without heart, and also the general condition, the physical world being subject to the astral levels and cut off from the celestial levels. Becoming more attuned to the latter is the task at hand. The best way to do it, like Gurdjieff said, is to work on your mind, body, and heart all at once. That's what I did. You don't have to be so rigorous about it, he took it a little too far. But some people like that kind of approach, I did when I was younger. The Hindus worked this all out, raja yoga and jnana yoga are for the mind, bhakti yoga is for the heart, and if you're so inclined, there's also the kind with the pants. But that's really the lowest form and usually done out of self-interest, so it's not really that spiritual. 

Everyone's going to hate me. At first, but I think you will come around.