Baba has repeatedly stressed the importance of sadhana (Hindu spiritual exercises) for example by meditation. He asserts that sadhana is important for achieving moksha or kaivalyam (liberation from ignorance and from the endless re-births due to karmic consequences). Sathya Sai Baba teaches the importance of Bhakti yoga (Hindu devotion to God). He preaches a strict morality with regards to sensual desires (including food, sex, meat, alcohol). Some of his exhortations are to put a ceiling on desires. By this, he seems to mean that followers should not waste time and money. He teaches that the world is just maya , that only God is real and that the seeming diversity of all life is another illusion. All life is one, he says. The meaning of life is to experience this oneness with God and other living beings. Followers attribute many miracles to him which they witness in his presence and in their own countries, like spontaneous vibhuti manifestations on the pictures of the guru in their homes, and bilocation, the appearance of Sai Baba in their own presence while he is also in another place. They also report that he has materialized out-of-season fruit several times. He says he performs these miracles to attract people and then to transform them spiritually. Sathya Sai Baba said that he does not speak through other people in a discourse in 1962. In spite of this, the British author Lucas Ralli claimed that he received messages from Sathya Sai Baba and wrote in his books that his claim was endorsed by Sathya Sai Baba in an interview. His books with messages from Sathya Sai Baba are sold by the Sathya Sai Book Center of America. The anthropologist Lawrence Babb wrote that he considered the teachings of secondary importance in the cult when compared to the emphasis on the miraculous. Babb further wrote about the Sai doctrine that "[...] there is little relatively to dwell upon, or at least nothing very distinctive. His philosophical views are simplistic, eclectic, and essentially unoriginal." The anthropologist Alexandra Kent notes that this lack of originality is in correspondence with Sathya Sai Baba's claim to revive old truths. The main objective of the Sathya Sai Organization, as Sathya Sai Baba himself says, "is to help you recognize the divinity inherent in you. So, your duty is to emphasize the One, to experience the One in all you do or speak.