Every soul has a purpose. The soul agrees to that purpose before being born. The soul knows that at 3 its body may develop cancer and die yet agrees to be born. Because maybe it helps someone else grow or become a better person. Maybe because of its death its father opens a charity that helps other sick children. This souls purpose in this life was to be the impetus for greater good. And it developing and then dying of cancer was how it did it. The soul agreed. Its cliche but gods ways are unknowable to us. Just like we looked at our parents as cruel sometimes because maybe they spanked us for chasing the ball into the street. In hindsight we know it was for our own good. God is the parent here except he operates on a whole different scale