The Gayatri Mantra is one of the most ancient mantras of this country. It is said that whoever sings (chants) it, is protected, gayantam trayate, yasmat Gayatri tyabhidhiyate. The important of this mantra lies in the fact that it deals with the relation between man and the universe as well as the Reality behind both — it is concerned with the process of Self-realization, the gradual unfolding of our essential nature, which is none other than the Upanishadic Brahman. Meditation on Gayatri leads one beyond the three states to the stateless condition of Turiya, the Undivided Consciousness.
A natural question then is: Is Gayatri only for the spiritual seeker and not for the man in the world involved in the pains and pleasures of daily living? The answer is an emphatic NO; for the uniqueness of Gayatri is in its universal application. It is as important to the spiritual seeker as to the practical householder. The importance becomes clear when we consider the fact that, not only is it as Mahamantra an indivisible element in all religious rituals, but it is also the mantra used for the daily sandhyavandanam (rite to be performed at dawn, dusk, and preferably at midday too) of the twice-born, Brahmin, Kshatriya and Vaishya.
There is a reason for such a universal application.