Gatyatri mantra.

OM = Almighty God
BHOOR = Embodiment of vital or spiritual energy
BHUVAHA = Destroyer of suffering
SWAHA = Embodiment of happiness
TAT = That (indicating God)
SAVITUR = Bright, luminous, like and sun
VARENIYAM = Supreme, best
BARGO = Destroyer of sins
DEVASYA = Divine
DHEEMAHI = May receive
DHIYO = Intellect
YO = Who
NAHA = Our
PRACHODAYAT = May inspire

OM BHOOR BHUVA SWAHA
OM TAT SAVITUR VARENIYAM
BARGO DEVASYA DHEEMAHI
DHIYO YONAHA PRACHODAYAT OM

GIVEN TO US BY RAJA RISHI VISHWAMITRAR,FIRSTLY RECITED BY HIM TO THE LORD,
Gayatri is a Mantra(vedic hymn) which inspires righteous wisdom its meaning is that the Almighty God may illuminate our intellect which may lead us to righteous path. This is most important teaching. All the problems of a person are solved if he is endowed with the gift of righteous wisdom. Having endowed with far sighted wisdom, a man is neither entangled in calamity nor does he tread wrong path. Righteous wisdom stars emerging as soon as a methodical recitation of this Mantra is performed.
"May we meditate on the Glory of the Lord, the Remover of pains and sorrows, the Bestower of happiness, Who has created the universe, and Who is the embodiment of knowledge and light. May the Lord, enlighten our intellect in the right direction by destroying all our sins and ignorance."
The Gayatri Mantra is the form of eternal truth. It is the heart of all beings and the eternal Ved Mantra. Gayatri destroys the sins of the world. All the four Vedas have originated from this mantra:
This can be translated: Aum. Let us contemplate the spirit of the divine of the earth, the atmosphere and heaven. May that inspire our minds. Savitri is the Sun and this mantra is recited at the three junctions or twilight of the day. Here is described how the mantra Aum hums in the base or Muladhara chakra, and moves through seven stages to the chakra above the head Sahasrara.
Maha Vishnu describes Aum as consisting of the following. Bhur is existence, Bhuvah is the elements, Svah is the Atma of everything, Maha is greatness and light, Tat is Brahman (the absolute). Tapah is all knowledge, Satyam is supremacy and internal wisdom. This tantra connects the three letters of Aum to the seven worlds.
Tat, refers to the first cause of all substance, as fire in the circle of the sun and is supreme Brahman. Savituhu is the source of all living beings. Varenyam is the excellent one who receives adoration.
Bharga destroys sin. Devasya means it is full of light, while Dheemahi refers to knowledge being golden and always within the sun. Dhiyo means Buddhi. Yo stands for energy (tejas).
In Bhavanopanishad, one witness within oneself the effulgent figure of Divine Mother with the different phases of the waxing and waning Moon.
The Devi is to be meditated upon as of a ruddy complexion, with eyes expansive, as an ocean overflowing with waves of grace, with noose, goad, arrows of flowers and a twig of sugar- cane in her hand, surrounded by Anima and other deities and ultimately as one´s own self.
1. Complete faith unflinching loyalty backed by a clear heart towards the deity is required for Sadhana.
2. Do not start Mantra Shakti under any pressure. Trust in God, kindness and patience should be the virtues of a Sadhaka.
3. Avoid harsh speech, lust, anger, restless thoughts, evil company and egoism. Do not get emotional. Mantras on hearsay should be avoided, as they must be authentic.
4. Sadhana done without any specific aim bears fruits early. In case you see any miracle, do not fear. Keep your WILL POWER strong and continue your Sadhana. All troubles will vanish.
5. Brahmacharya or celibacy should be observed during Sadhana. In case of failure, do not lose heart. Try it again and again and you will be crowned with success.