Among all the mantras, the Gayatri is called the essence of all mantras. All spiritual powers and potencies are contained hidden within it. The Gayatri is meditation on spiritual light. In all the teachings and scriptures, Gayatri is called supreme in bestowing enlightenment. It is practiced by Hindus and Buddhists alike.
This master mantra is specifically for the purpose of enlightening the intellect. Once the intellect is flooded with the energy of enlightenment, it “informs” the mind with transcendent ideas.
Short Form of Gayatri (the most commonly used form):
Om Bhur Bhuvaha Swaha
Om Tat Savitur Varenyam
Bhargo Devasya Dhimahi
Dhiyo Yonaha Prachodayat
O Self-Effulgent light that has given birth to all the spheres of consciousness, who is worthy of worship and appears through the orbit of the Sun, illumine our intellect.
Here is a rough breakdown of the individual phrases of the long version:
Om Bhur: Om and salutations to the earth plane (first chakra)
Om Bhuvaha: Om and salutations to the atmospheric plane (second chakra)
Om Swaha: Om and salutations to the solar region (third chakra)
Om Maha: Om and salutations to the first spiritual region beyond the sun (fourth chakra)
Om Janaha: Om and salutations to the second spiritual region beyond the sun (fifth chakra)
Om Tapaha: Om and salutations to the third spiritual region beyond the sun, sphere of the progenitors (sixth chakra)
Om Satyam: Om and salutations to the abode of the supreme truth (seventh chakra)
Om Tat Savitur Varenyam: Om and salutations to that realm which is beyond human comprehension
Bhargo Devasya Dhimahi: In that place where all the celestials of all the spheres have
Dhiyo Yonaha Prachodayat: Received enlightenment, kindly enlighten our intellect