The meaning of the Gayatri mantra is as follows

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.

Swami singing the Gayatri	1 x
Swami singing the Gayatri	3 x
Meaning of the Gayatri - from Swami's discourses
Significance of the Gayatri
Significance of the Gayatri - Study Circle
The Power and Potency of the Gayatri Mantra - Booklet available for order from the Sathya Sai Baba Society and Book Center of America