A realized and liberated (Jivanmukta) yogi or yogini who has entered the level of nirvikalpa samadhi can voluntarily depart their body and gain enlightenment at the time of death while in a profound, conscious meditation state, according to this concept. Many great spiritual teachers have taught that it is possible to reach enlightenment before or after dying, but most of them were not able to exit their physical bodies. Nirvikalpa means "without residue" or "untainted". In other words, a person in nirvikalpa samadhi has overcome all attachment to life, including his or her own life. A realized soul is free from the cycle of birth and death. He or she has conquered lust, anger, greed, ignorance, and other afflictions of the mind and has attained enlightenment, which means being free from all attachments, including freedom from attachment to enlightenment. In traditional Buddhism, there are three levels of consciousness: the waking, dreaming, and deep sleep states; the dream world; and the unconscious mind. The deep meditative states of yoga are beyond these three levels of consciousness and lie far beyond human experience. Yet, some highly advanced meditators are said to have access to higher levels of consciousness during their practices. The Buddha never claimed to have discovered any new truths about the universe when he was in deep meditation.