As the expression goes, "There is a time and a season for everything." This very fundamental truth of Universal experience applies to every soul entering or exiting this physical earth dimension. Nothing in this Universe is by chance. Everything and everyone is part of a very integrated and complex Universal Process. Entire species have appeared and disappeared from the earth plane dimension. Everything has its time, or at least, the appearance of it. Everything exists and comes into being in Universal Consciousness or the Mind of God.
There is a larger picture-the Universe-with smaller details in the picture, such as the individual human expression. And yet the larger and the smaller are identical, and therefore everything is interdependent-that is, one could not exist without the other. As the seen universe is always in motion, all of its parts or details or humans are part of a very integrated process. What happens with one of its parts-the human-affects the entire whole, and how it manifests. Each depends on the existence of the other in order to exist.
Eventually, whether in this physical lifetime or another, we become aware of the various states of our beingness; and through the Grace of God's Presence, we integrate all levels into a harmonious working Wholeness of Beingness.