The Gayatri Mantra is the most hallowed mantra of the Vedas. It is considered the "mother of all the mantras“

Aum bhur bhuvah svah 

tat savitur varenyam 

bhargo devasya dhimahi 

dhiyo yo nah pracodayat 

We meditate on the transcendental glory of the Deity Supreme, who is inside the heart of the earth, inside the life of the sky and inside the soul of the Heaven. May He stimulate and illumine our minds.