Pierre Teilhard de Chardin taught that if you follow the ancestry of current animals and plants back to their earliest ancestors, you go back to the most simple life forms. Contrary to the popular notion that evolution favors the strongest, Chardin showed that evolution is actually a steady march from simple to complex.

Just taking a look at the animal side, they went from single-celled animals to the multi-celled sponges which, while multi-celled, all cells are they same, more like a cooperative of many individuals than a single animal. Later, cells start to perform different functions and eventually we have animals with internal organs, eyes, a circulation system, lungs or gills, etc. And this movement toward complexity continues and seems to be inevitable, but why?

If evolution was really the result of just random changes, than why is it always becoming more complex? If the idea is that the strongest will survive, than why become more complex? We all know that making machinery more complex may make it more useful to us, but it also makes it more prone to breaking down and makes it need more care and maintenance. So that doesn't seem to be a sensible thing for evolution to do unless there is something else to it.

There is something else, and that is spirit. It is the origin of all living things, really all matter, in spirit. Some people actually believe for some reason that the decent of spirit into matter was actually an improvement. In what way? Spirits do not get sick, they don't die, they don't suffer pain. Spirits can “move” from one location to another millions of miles away in an instant because they don't occupy time and space at all, they exist beyond all that. And matter cannot exist without spirit. Further, spirit acts something like a mold or a plan for evolution. Evolution is not moving us into something new and unknown, it is returning us to our spiritual origins.