I would say so. We run into problems if we don't. Problems like conceptualizing new things etc. It's similar to a computer, there is an opinion that a computer can 'program itself,' we know this is incorrect, as someone had to create the original 'program'.
Every idea in the mind is ultimately traceable to a thing, or events, actually existing in the world independent and apart from the mind. An idea is the subjective evocation of an objective fact. Clear ideas, then, are ideas that faithfully reflect the objective order from which they derive. Unclear ideas, however, give us a distorted representation of the objective world. To ensure that our ideas are clear, we must vigilantly attend to the relationship between any given idea and its object or event.
It is incorrect to suppose that because we know things only through our ideas that it is only our ideas which we really know. Our ideas are the means, not the ends, of our knowledge. They link us to the world. Clear ideas create strong links. The most efficient way to clarify ideas is to look through them to the objects/events they represent.