world of human beings ［人界］ ( nin-kai): Also, realm of human beings or world of humanity. The fifth of the Ten Worlds. When viewed as a state of life, the world of human beings indicates a condition in which one can control one’s instinctive desires with reason and act in a humane fashion. In The Object of Devotion for Observing the Mind, Nichiren describes “calmness” as characterizing the world of human beings. Maintaining calmness, however, is not easy; it requires self-control. This is why, among the Ten Worlds, the world of humanity is considered the first step toward acquiring self-control. Also characteristic of this condition is the desire for self-improvement, the will to seek a higher state of life. Without constant effort, however, one in this world will regress and fall into the lower of the Ten Worlds.