A Sanyasi when he takes to this path, he takes to Diksha from his Guru who initiates him in Sannyas. He takes Diksha, Sannyas Diksha and he is to abide by the directions, injunctions given by the Guru. He has to obey. Obedience to Guru. Guru dictates. Guru's directions he has to obey. So obedience becomes an integral part of the Sanyasi life. He is free as air, but he is bound by the dictates of the Guru. Obedience is the integral part. Then celibacy is also equally an integral part of Sannyas. He has to lead the single blessedness. He has to take a vow of celibacy. Vow of obedience. He also takes a vow of Aparigraha, non-possession, non-accumulation. He doesn't want a house. He doesn't want a shelter. He doesn't care for food. He is a-niketan. So the vow of Aparigraha. Parigraha means acquisition. Aparigraha means nonacquisition. Parigraha means possession. Aparigraha means non-possession.
So these three Vows a Sanyasi has to take. Vow of obedience, vow of celibacy and vow of Aparigraha. Aparigraha means austerity, uncertainty, because he doesn't store anything for himself. He has no house and doesn't store for tomorrow. He will not have even some luggage. At the most he may have a Kamandalu and he may have a staff and few clothes and he wanders all over the world. Even in non-Sanyasi order of our concept, there are three vows which everybody has to take.