You have two ears and one mouth for a very good reason.
"I remind myself every morning: Nothing I say this day will teach me anything. So if I'm going to learn, I must do it by listening." Larry King
"There are very few people who don't become more interesting when they stop talking." Mary Lowry
Listening is hard to do. We're often not really listening, but simply waiting to talk.
Observation? You usually see what you want to see, not what's actually in front of you.
Simple, really. Open your ears and eyes, close your mouth, and discover what you've been missing.
You might just find The Answer or The Deal or The Person you've been looking for, but were just too yappy to notice.
There, I've said enough. Even I'm listening.