With an infinite God having been posited, the allowance of evil leads to a greater good than if evil were absent and good only present; therefore, the third life principle stands as the fact that any and all evil, no matter how insignificant or how great, brings about and leads to a greater good than if the evil were entirely absent.
God exists as provable by rational thought in many ways.
There is evil in the world that God has created, surmountable by the fact of the goodness of God.
If God exists, he is infinite goodness, as nothing can surpass the causal force of the universe and creation in perfection. For just as a rolling ball causes another ball to continue rolling upon contact with lesser speed, so God causes the existence and goodness in other entities with there being lesser goodness and perfection upon causation in those that follow.
There is no contradiction between a God of infinite goodness and a world filled with suffering as evil serves a purpose towards good that is greater than is imaginable, partially in time if not fully and certainly for longer durations.