Land of Eternally Tranquil Light ［常寂光土］ ( jōjakkō-do): Also, Land of Tranquil Light or Land of Eternal Light. The Buddha land, which is free from impermanence and impurity. The Land of Eternally Tranquil Light is one of the four kinds of lands described in the doctrine of the T’ien-t’ai school, the other three being the Land of Sages and Common Mortals, the Land of Transition, and the Land of Actual Reward. In many sutras, this sahā world is described as an impure land filled with delusions and sufferings, and the Buddha land as a pure land free from these and far removed from this sahā world. In contrast, the Lotus Sutra reveals the sahā world to be the Buddha land, or the Land of Eternally Tranquil Light, and explains that the nature of a land is determined by the minds of its inhabitants.