"The words and values we use to describe nature are all imprecise approximations, many are wildly wrong. We observe phenomena all around us, and if you try to describe what it is, and ask "why" enough times then you get down to the discussion of what frame of reference we use to observe the universe. We have a body of knowledge, and we tack on new observations onto that body, occasionally the body reforms and the philosophy changes. Every learner has a philosophy.
Philosophy is where the rubber meets the road in figuring out what our universe is. Is matter a particle or a wave or other, it depends on your existing perspective, your philosophy.