Gayatri Mantra

OM BHUR BHUVAH SVAH
TAT SAVITUR VARENYAM
BHARGO DEVASYA DHIMAHI
DHIYO YONAH PRACHODAYAT



More info about Gayatri mantra

The Gayatri Mantra is most famous and powerful mantra ("power sound prayer") of Hinduism. It is said to have been revealed to the great sage Vishwamitra, preceptor of Prince Rama of the Ramayana religious epic. Its origin, however, is believed to have been the supreme creative force Brahma, before the Vedic scriptures were revealed. Thus the Gayatri mantra has been named "Vedamata" (Mother of the Vedas).

Every devout Brahmin is required to perform the Gayatri mantra each morning and evening. The mantra is addressed to the sun as "Savitri," personified as a goddess, wife of Brahma. The mantra translates roughly as "Earth, sky, heaven, we meditate on these and the ineffable light and power of the resplendent sun, may it guide our understanding."
The three regions of earth, sky, and heaven are also associated with physical, emotional, and mental states. Mantras, when properly intoned, vibrate the body. Some practitioners have combined the repetition of the Gayatri mantra with pranayama (breathing techniques) in order to activate the psychic body, especially as it is pictured in the chakras or mystical centers, and thus arouse kundalini energy (which is seen as resting latent at the base of the spine) to transform consciousness.
(source: www.answers.com)

The Gayatri Mantra is a highly revered mantra in Hinduism, second only to the mantra Om. It consists of the prefix om bhur bhuvah svaha, formula taken from the Yajurveda, and the verse 3.62.10 of the Rigveda (which is an example of the Gayatri mantra). Since all the other three Vedas contain much material rearranged from the Rig Veda, the Gayatri mantra is found in all the four Vedas. The deva invoked in this mantra is Savitr, and hence the mantra is also called Savitri.
By many Hindus, the Gayatri is seen as a Divine awakening of the mind and soul, and within it a way to reach the most Supreme form of existence, and the way to Union with Brahman. Understanding, and purely loving the essence of the Gayatri Mantra is seen by many to be one, if not the most powerful ways to attain God. (source: www.wikepedia.com)