I would assume that is because he is not that good of a talker and/or because his thought of train is not easily comprehendable. Yet for me what I have understood is enough to believe.
Her maid is gone, and she prepares to write, First hovering o'er the paper with her quill: Conceit and grief an eager combat fight; What wit sets down is blotted straight with will;
This is too curious-good, this blunt and ill: Much like a press of people at a door, Throng her inventions, which shall go before. - The Rape of Lucrece, William Shakespeare
then he should work to make his thoughts more understandable before speaking. If he is unclear about what he is talking about 1)why should we listen & 2)how will we know what he means?