he Rig-Veda, dating to about 1500 BC, speaks of Brahman, the power inherent in the spoken syllables of the Veda. These syllables when spoken aloud were thought to contain great magical power.
As time went by, the word transformed into a more abstract concept, referring to the essence of the universe, the underlying realilty behind all phenomena that exist.
The seed of this idea, can already be found in the Rig-Veda itself. For instance, in the much-quoted line:
'They call it Indra, Mitra, Varuna, Agni, and it is the heavenly bird that flies. The wise speak of what is ONE in many ways; they call it Agni, Yama, Matarishvan.'
"The Great World History Book"