om bhūr bhuvah svah
tat savitur varenyam
bhargo devasya dhīmahi
dhiyo yo nah pracodayāt

Meaning: Om, the Parbrahm or Supreme Soul (God) pervades the three worlds – the Earth (bhu), the space (bhuvah) and beyond the space (svah) where exists nothing but God alone in His purest form. That God is in the form of infinite light, which is beyond comparison. Let us meditate on that divine light of the Supreme Soul. Its meditation will lead us to God realization.

Poetry:
Three worlds you know,
certainly these come to sight;
The bhu, bhuva and svah,
shine by His limitless light.

Bhu is this Earth,
we all dwell in this place;
Bhuva is the universe,
svah is beyond the space.

God pervades all,
His infinite light is all over;
They behold that light,
to Him alone who adore.

Behold His immense light,
it purifies the intelligence;
Vedas call Him Ritambhra (Supreme wisdom),
that intelligence who attains.

Gayatri sums up the Vedic wisdom,
Om is the soul of Gayatri, wise discrens;
When Om sets into life-breaths,
never to the world one returns.