We have many types of appetites. Some are no good for us and some are only good in moderation. Unless you count love for God. A hearty appetite of love for God does not need to be controlled. And God says if we love Him we'll show it by our care for one another. I think humans remain helpless babies longer than the rest of the animal kingdom because adults who care for them need more time to learn selfless love. Until I had a child to care for I didn't really understand the nature and purpose of love.