A simple thing has few qualities, a complex thing has many qualities. Imagine it like a machine. You can have a see-saw and a pully winch. Both can be used to raise a load from one level to another, but one has few qualities (moving parts) and the other has many. Therefore, one is simple and the other complex.
God is posited to have only one quality (existence) whilst the universe is made up of an apparently infinitely regressing series of particles with infinitely multiple interrelationships (ugh).
So God is simple and the universe is complex.
Well, this is philosophy. If you study metaphysics you'll see that all sciences regress to a point where we rely on unprovable laws, and there is no pure knowledge.
Personally, I think the study of philosophy is important because it promotes self-awareness, particularly of our own infallibility. A Physicist who does not study metaphysics will likely fail to realise that his experience of the world is filtered through a flawed lens. As a result he may conclude he has THE FACTS and therefore can discover THE TRUTH.
This is a dangerous intellectual position - and one which should be avoided at all costs.
Beyond that, I find philosophical intercourse enjoyable.
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