What is "density" really? It is simply the heavyness and thickness of your mind - Mayas veil. A mind full of dense/slow energies like shame/hate/anger etc. will be very heavy and clouded. Hawkins scale is compatible with the Indian yoga teachings about the Gunas:
level 1 to 199 equals "Tamas"In the philosophy of Yoga, all matter in the universe arises from the fundamental substrate called Prakriti. From this ethereal Prakriti the three primary gunas (qualities) emerge creating the essential aspects of all nature—energy, matter and consciousness. These three gunas are tamas (darkness), rajas (activity), and sattva (beingness).
Level 200 to 499 equals "Rajas"Tamas is a state of darkness, inertia, inactivity and materiality. [...] Tamas - accounts for restraint and inertia. Experienced psychologically as delusion, depression and dullness. Classical Yoga: - when tamas (obscurity, heaviness) predominates, consciousness is sthiti - inert, punged into a state of repose and torpor.
Level 500 to 599 equals "Sattva"The mind’s psychological qualities are highly unstable and can quickly fluxuate between the different gunas. The predominate guna of the mind acts as a lens that effects our perceptions and perspective of the world around us. Thus, if the mind is in rajas it will experience world events as chaotic, confusing and demanding and it will react to these events in a rajasic way. [...]
Rajas is a state of energy, action, change and movement. The nature of rajas is of attraction, longing and attachment and rajas strongly binds us to the fruits of our work. [...] Rajas - accounts for motion, energy and activity. Experienced psychologically as suffering, craving and attachment. Classical Yoga: - when rajas (energy) predominates, consciousness is pravritti - active and energetic, tense and willful.
Source: http://www.spiritual-teachers.com/articles/guna.htmSattva is a state of harmony, balance, joy and intelligence. Sattva is the guna that yogi/nis achive towards as it reduces rajas and tamas and thus makes liberation possible. [...] Sattwa - Samkhya: accounts for thought and intelligibility, experienced psychologically as pleasure, thinking, clarity, understanding and detachment. Classical Yoga: - when sattwa (purity, illumination through comprehension) predominates, consciousness manifests itself as prakhya - vivacity, illumination, mental clarity and serenity.
To better understand Hawkins scale and the Gunas I have made an illustration:
The mirror of "reality" changes according to your "level of consciousness" (LOC). Below 200 people live only in the 3D material world. They are not in touch with their "higher self" or "meta-consciousness", and thus they do not have the "distance" to overview the everchanging "mind". They simply react spontanously as if what they feel/think etc. is "the truth" of any situation. Such people project a lot of their negativity on to the world and people around them. They draw more energy from their surroundings than they give back. They put themselves above all others and the Whole or God.
Between 200 and 499 the mind becomes much lighter and less dense, and thus the beings energy level rises accordingly. With this excess of energy beings will give as much - or more - back to the surroundings (and the Whole) than they take.
The level 500-599 is the sattvic level of clarity and a calm mind. People at this level have cultivated an attitude of love, service and giving because they understands what Jesus talked about when he said: "Give and ye shall recieve". They are often recognized as Saints/Bodhisattvas or "Holy" persons, but they can also work anonymously and never be recognized. Either way they do not care. Full blown enlightenment is the next step for such beings. Enlightenment and spiritual growth is a process of integration, and not segregation. The truth includes everything. How can it not? The never-changing eternal meta-consciousness is beyond the ever-changing mind. It thus has peace and view, whereas the mind does not.
Reading all the books in the world will not necessarily help us letting go of the dense ego/mind content and grow into ever more clarity. Often it can simply clog it even more because we tend to cling to "knowledge" we have read as "the truth". The truth/love is in the meta-consciousness and one will have to work oneself through many levels/layers of "mind-stuff" to attain it. It is simply a process of surrendering or letting go of "untruth" and the truth will shine forth of its own accord. The illusory mind with all its projections only seemingly negates the meta-consciousness just like the clouds seemingly negates the Sun. Meditation is simply relaxing into the meta-consciousness which is the center of your beingness in the eternal "now". The beauty of art/poetry/music/nature and also laughter/humor will sometimes stop the mind (and thus "time") in its tracks, and a moment of eternity/clarity/purity/beauty/freedom is experienced.