The Gayatri mantra is the most important mantra which is taught with reverence. It is taught during the ceremony of Upanayanam. Please read the significance of the gayatri mantra in the article given below.
http://spirituality.knoji.com/the-gayatri-mantra-a-close-look-at-the-significance-and-power/
http://spirituality.knoji.com/the-gayatri-mantra-a-close-look-at-the-significance-and-power/
