The Gaayatri Mantra is the most power mantra in this universe. I say it without any reservations. It is a praise, meditation and a prayer all combined into one all powerful mantra.
The mantra was presented to the world by Sage Viśvāmitra. It goes as.
Oṃ bhūr bhuvaḥ svaḥ
tát savitúr váreṇ(i)yaṃ
bhárgo devásya dhīmahi
dhíyo yó naḥ pracodáyāt
Baba explains its meaning with each individual word as,
Om: The primeval sound
Bhur: the physical world
So it is understood as,
We contemplate the glory of Light illuminating the three worlds: gross, subtle, and causal.
I am that vivifying power, love, radiant illumination, and divine grace of universal intelligence.
We pray for the divine light to illumine our minds.
If you see this Mantra is beyond religion. It does not talk about a form of God for He is formless. It is a meditation and prayer toward the formless all pervading Being. It is an ernest prayer to see Unity in all apparent diversity. It is thus through constant contemplation on the meaning of Gayatri Mantra leads one toward Divine Consciousness.