Why Gayatri mantra is given this importance. This mantra in 'Gayatri chandas' is one among the 10,472 mantras in Rig veda. All other mantras recited to invoke grace of different deities, but this mantra recited to 'inspire the intelligence'. What is this intelligence? it is the intuitive or inspired intelligence, to lead a spiritual life, to attain the eternal happiness.
Gayatri mantra is considered as a powerful mantra which is usually used to be chanted during early morning and evening. It is said that chanting this mantra many times in the correct 'chandas' (vocal) will reduce mental pressure and tension, reduce BP.
ॐ भूर्भुवः स्वः। तत्सवितुर्वरेण्यम् भर्गो देवस्य धीमहि।
धियो यो नः प्रचोदयात्॥
om bhūrbhuvaḥ svaḥ | tatsaviturvareṇyam bhargo devasya dhīmahi |
dhiyo yo naḥa pracodayāt ||
dhiyo yo naḥa pracodayāt ||
i put naha above in bold because, many people chant this by nah (nah means don't, thus meaning of mantra will be in opposite!!, so please note it, its naha)
Loosely translated in English
Which deva or GOD who enlightens this world and universe, may also enlighten my intelligence