 By realizing this, one can realize that all laws remain settled for a vast number of eons, but even after a vast amount of time, they change.The essence of this chapter is the urgent advice to master and practice the teaching of the sutra for the spiritual merit to be gained from it, the good life it leads to, and the usefulness to mankind and the world that it makes possible.Mentioned earlier in this sutra, the teachings of the Buddha are the truth of the universe.