Gāyatrī Mantra
Aum bhūr bhuvaḥ svaḥ
tat savitur vareṇyaṃ
bhargo devasya dhīmahi
dhiyo yo naḥ prachodayāt
– Rigveda 3.62.10
What does it mean?
General meaning: We meditate on that most adored Supreme Lord, the creator, whose effulgence (divine light) illumines all realms (physical, mental and spiritual). May this divine light illumine our intellect.
Word meaning: Om: The primeval sound; Bhur: the physical body/physical realm; Bhuvah: the life force/the mental realm Suvah: the soul/spiritual realm; Tat: That (God); Savitur: the Sun, Creator (source of all life); Vareñyam: adore; Bhargo: effulgence (divine light); Devasya: supreme Lord; Dhīmahi: meditate; Dhiyo: the intellect; Yo: May this light; Nah: our; Prachodayāt: illumine/inspire.
“The Gayatri is a universal prayer enshrined in the Vedas. It is addressed to the Immanent and Transcendent Divine which has been given the name 'Savita,' meaning 'that from which all this is born.' The Gayatri may be considered as having three parts - (i) Adoration (ii) Meditation (iii) Prayer. First, the Divine is praised, then It is meditated upon in reverence and finally, an appeal is made to the Divine to awaken and strengthen the intellect, the discriminating faculty of man.
The Gayatri is considered as the essence of the Vedas. Veda means knowledge, and this prayer fosters and sharpens the knowledge-yielding faculty. As a matter of fact, the four core-declarations enshrined in the four Vedas are implied in this Gayatri mantra.”
— Sri Sathya Sai Speaks, vol 13.34: June, 20, 1977