Yoga is the effort to experience one's divinity personally and then to hold on to that experience forever. Yoga is about self-mastery and the dedicated effort to haul your attention away from your endless brooding over the past and your nonstop worrying about the future so that you can seek, instead, a place of eternal presence from which you may regard yourself and your surroundings with poise. Only from that point of even-mindedness will the true nature of the world (and yourself) be revealed to you. True Yogis, from their seat of equipoise, see all this world as an equal manifestation of God's creative energy—men, women, children, turnips, bedbugs, coral: it's all God in disguise. But the Yogis believe a human life is a very special opportunity, because only in a human form and only with a human mind can Godrealization ever occur. The turnips, the bedbugs, the coral—they never get a chance to find out who they really are. But we do have that chance.

"Our whole business therefore in this life," wrote Saint Augustine, rather Yogically, "is to restore to health the eye of the heart whereby God may be seen."

Like all great philosophical ideas, this one is simple to understand but virtually impossible to imbibe. OK—so we are all one, and divinity abides within us all equally. No problem. Understood. But now try living from that place. Try putting that understanding into practice twenty-four hours a day. It's not so easy. Which is why in India it is considered a given that you need a teacher for your Yoga. Unless you were born one of those rare shimmering saints who come into life already fully actualized, you're going to need some guidance along your journey toward enlightenment. If you're lucky enough, you pilgrims have been coming to India to seek for ages. Alexander the Great sent an ambassador to India in the fourth century BC, with a request to find one of these famous Yogis and return with him to court. (The ambassador did report finding a Yogi, but couldn't convince the gentleman to travel.) In the first century AD, Apollonius of Tyrana, another Greek ambassador, wrote of his journey through India: "I saw Indian Brahmans living upon the earth and yet not on it, and fortified without fortifications, and possessing nothing, yet having the richness of all men." Gandhi himself always wanted to study with a Guru, but never, to his regret, had the time or opportunity to find one. "I think there is a great deal of truth," he wrote, "in the doctrine that true knowledge is impossible without a Guru."

A great Yogi is anyone who has achieved the permanent state of enlightened bliss. A Guru is a great Yogi who can actually pass that state on to others. The word Guru is composed of two Sanskrit syllables. The first means "darkness," the second means "light." Out of the darkness and into the light. What passes from the master into the disciple is something called mantravirya: "The potency of the enlightened consciousness." You come to your Guru, then, not only to receive lessons, as from any teacher, but to actually receive the Guru's state of grace.