The Voice Narrates the Outside World

You already see what's happening outside. How does it help to repeat it to yourself through the mental voice? You should examine this very closely. With a simple glance, you instantly take in the tremendous detail of whatever you're looking at. By verbalizing it mentally, you brought that initial direct experience of the world into the realm of your thoughts. There it becomes integrated with your other thoughts, such as those making up your value system and historical experiences. It is actually narrating the world for you.