Dinka religious thought posits the existence of a distant but ubiquitous divinity called Nhialac. All life emanates from and ultimately reverts to Nhialac, whereas a different stratum of spiritual agents provides the Dinka with the means of communicating with the supreme divinity. The Dinka also recognize a large number of spiritual agents that are directly susceptible to human control, through the ritual actions of diviners and healers. Traditionally, the Dinka did not imagine that another world awaited them after death, but much concern was expressed about the abilities of the "ghosts" of the recently deceased to affect the well-being of the living.