The chanting of Gayatri mantra sharpens the intellect and brightens the memory. A new mirror reflects clearly, but over time, dust gathers and it needs cleaning. Similarly, our mind becomes tainted with time, the company that we keep, the knowledge we receive and our latent tendencies. When we chant the Gayatri mantra, it is like deep cleansing, so that the mirror (the mind) reflects in a better way. Through the mantra, the inner glow is kindled, the inner plane is kept alive. One gains brilliance in both the inner and outer worlds.