It’s the quality of words that’s important, not the quantity.
If you are involved in an important discussion, filling the air with noise simply adds to the pollution. The point should not be to make a display of verbal acrobatics, but to make yourself understood (by the way, this is your responsibility; they have no obligation to understand you if you are not clear). A torrent of words will drown out the central issue.
It’s important to say what you need the other person hear. In order to do that, you must turn your steely gaze inward, because you must first understand what you really want to say. Choose the ingredients wisely, so that the listener can disgest you words.
Less is more. A couple of sentences can be enough. If they sincere and objective they will do more good than hours of unstructured blather.