The ancient and medieval scholars of Indian religions discussed suicide, and a person's right to voluntarily choose death. Suicide is approved by Buddhist, Hindu and Jaina texts. The "Satapatha Brahmana" of Hinduism, for example, in section 10.2.6 discusses the nature of cyclic life and rebirth, and concludes that "therefore, one should not depart before one's natural lifespan", states David Brick, an Indologist at the Yale University. However, for those who have renounced the world (sannyasi, sadhu, yati, bhikshu), the Indian texts discuss when ritual choice of death is appropriate and what means of voluntarily ending one's life are appropriate. The "Sannyasa Upanishads", for example, discuss many methods of religious death, such as slowing then stopping consumption of foods and drinks to death (similar to "sallekhana"), walking into a river and drowning, entering fire, path of the heroes, and the Great Journey.