III refers to the past world, the present world and the future world. Everything or phenomenon in the world is a causal chain in the past, present and future time migration. The past is the cause, and the present is the result; The present is the cause, and the future is the result. This is called three-life karma. Buddhist theory, the cycle of all beings, attracts the present karma based on the past karma, and then attracts the future karma based on the present karma. If cause and effect continue, life and death are endless, which is the cause and effect of the life and death cycle of all beings in the mysterious world.