It's so simple I almost came in my pants when I had this revelation. If anyone ever asks you to define philosophy, just say "philosophy is the meta of thought". This is the clearest, simplest and most apt definition of philosophy there could ever be.
That which you have no words for cannot be thought about
Our thoughts are dependent on reality level we can conceive of - direct expirience can't be put to words but can be remembered. States of Reality vs Concept Concreteness: The real is more defined because it is closer to our frame of reference - the concrete physical world.