"The Gayatri is perhaps the greatest and most beautiful of all the ancient mantras. It has been chanted all over India from time immemorial... in an antiquity so remote that the very memory of it has been forgotten, the altruistic use of such mantras was fully comprehended and practiced. It begins always with the sacred word Om, and with the enumeration of the planes upon which its action is desired—the three worlds in which man lives, the physical, the astral and the mental;"