Hrm.
This verges on something I've said although I don't entirely believe it.
Which is that if you can't say it, you don't know it. Most of the time I see a confused, turgid attempt at explanation which is often circular, badly phrased, and all in all difficult to read, after much discussion to drill down to the actual idea I'll discover one that is similarly incoherent.
Not to say you can't have one of those blinding bits of insight that you can't manage to put into language. Dancing about architecture and all that, after all. Nor that you can't make a melodious and grammatical uttering that is nonetheless complete nonsense.
There's also a mirror case. Seems often that when you have a problem, if you can manage to put it clearly and cleanly in words, you will have without intending to also spoken the solution.