On the three cities of: 
Waking, dreaming, deep sleep
Conscious, unconscious, subconscious
Gross, subtle, causal 
And the Fourth (Turiya), which is beyond the three cities. (tripura)

See also these articles to understand the 
three cities or levels, plus the fourth:
Levels and Domains of Consciousness 
OM and the Seven Levels of Consciousness 
Cake and Consciousness 
Computers and Consciousness 
Index of Articles on Levels 
Schools of Tantra 
Lalita Tripurasundari 
Lalita's Paradise Island  

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Tripura Upanishad:

Om ! Speech is rooted in my thought (mind) and my thought is rooted in my speech. Be manifest, patent, to me; be ye two, for me, the lynch-pins of the Veda. Let not Vedic lore desert me. With this mastered lore, I join day with night. I shall speak what is right; I shall speak what is true. Let that protect me; let that protect the speaker. Let that protect me. Let that protect the speaker, protect the speaker !
Om ! Peace ! Peace ! Peace !

1. Three cities [tripura] are there, and pathways three for all.
(On the dais of Fortune) are letters a, ka, tha and others.
In them there dwells, never-ageing, ancient,
The exceeding grandeur of the gods.

2. Subject to Her whose sources are nine
Shine forth the centres nine and Yogas nine,
Nine deities and regents of the planets nine,
Gentle healing deities nine and gestures nine.

3. The One she was, the Foremost;
She was the nine, the nineteen and the twenty-nine;
The forty, she; may the radiant energies three,
As fond mother’s love, encircle me.

4. In the beginning was upblazing Light;
Gloom and Motion stretched athwart the Ageless;
The Moonlight gladness and delights; these spheres
Adorn indeed (the knowers of Brahman).

5. Of the three lines, abodes, three worlds and three spheres
With triple constituents (She is the prop).
This group of three among the sheaths is prime.
In diagram drawn with mystic words
The God of Love with Fortune’s Goddess dwells.

6. The Exhilarating and the Proud,
The Auspicious, the Lucky and the Lovely,
The Perfected, the shy, the Witty One,
The Gratified, the chosen and the Full,
The Wealthy, the Forbidden, the Graceful,
The Eloquent – (These on Consciousness do wait).

7. Attended thus the Power of Consciousness
Is drunk with the draught of Immortality;
Knowing Her and worshipping Her throne
(Her devotees) on heaven’s great vault do dwell
And enter the supreme Triple City.

8. Desire, the womb, the Digit of Desire,
The Wielder of the Thunderbolt, the Cave,
Ha sa, the Wind, the Cloud, the King of Heaven,
Yet again the Cave, sa ka la and maya –
Such is the primeval Wisdom, embracing all,
Mother of the vast universe.

9. Uttering in secret Her three basic letters –
The sixth, the seventh and the eighth –
Lauding the Lord, the theme of the Upanishads,
The Seer, the Fashioner, the Free to Will,
(Seekers) achieve the state of Immortality.

10. The Mother of the Universe sustains
Her abode – the Destroyer’s Face, the Circle of the Sun,
The core of sounds, the span of time,
The Eternal, half the lunar month;
With sixteen (She sustains the core of their abode).

11. Or, worshipping the digit of desire in its manifold forms,
Enthroned in the three cavernous homes and in symbols
Of the rounded breasts and face set in the spheres,
The man of desires gains that which he wants.

12. Dressed fish, goat’s flesh,
Cooked rice, pleasure of sex,
Who offers to the Goddess great,
Merit and success for himself achieves.

13. With (Sarasvati) fair and (Lakshmi), World’s Mother,
(Gauri), roseate, primeval Power, withdrawer of the world,
Binds with noose creatures who grasp, and tread
Attachment’s path; and swiftly smites with bow and arrows five.

14-15. The Power of Consciousness and desire’s Lord,
Lord of auspicious powers, coequals both,
Of equal prowess, in energy equal,
Grant gifts to the fortunate here.
Of the two, the un-ageing Power, the world’s womb,
With offering of knowledge pleased,
Removes the aspirant’s twofold sheath.
With mind averted from illusion’s sphere
He becomes Creator, Protector,
Withdrawer of the world;
Nay, one with Cosmic Being.

16. This is Tripura’s great Upanishad,
Imperishable, which, in glorious words
The Rig, Yajus, Saman and Atharvan
And other forms of knowledge laud.

Om, Hrim, Om, Hrim – thus ends the secret doctrine.

Om ! Speech is rooted in my thought (mind) and my thought is rooted in my speech. Be manifest, patent, to me; be ye two, for me, the lynch-pins of the Veda. Let not Vedic lore desert me. With this mastered lore, I join day with night. I shall speak what is right; I shall speak what is true. Let that protect me; let that protect the speaker. Let that protect me. Let that protect the speaker, protect the speaker !

Om ! Peace ! Peace ! Peace !

Here ends the Tripura Upanishad, included in the Rig-Veda.

This site is devoted to presenting the ancient Self-Realization path of the Tradition of the Himalayan masters in simple, understandable and beneficial ways, while not compromising quality or depth. The goal of our sadhana or practices is the highest Joy that comes from the Realization in direct experience of the center of consciousness, the Self, the Atman or Purusha, which is one and the same with the Absolute Reality. This Self-Realization comes through Yoga meditation of the Yoga Sutras, the contemplative insight of Advaita Vedanta, and the intense devotion of Samaya Sri Vidya Tantra, the three of which complement one another like fingers on a hand. We employ the classical approaches of Raja, Jnana, Karma, and Bhakti Yoga, as well as Hatha, Kriya, Kundalini, Laya, Mantra, Nada, Siddha, and Tantra Yoga. Meditation, contemplation, mantra and prayer finally converge into a unified force directed towards the final stage, piercing the pearl of wisdom called bindu, leading to the Absolute.