Listen

Shut-up and listen: 

Great leaders know when to dial it up, dial it down, and dial it off (mostly down and off). Simply broadcasting your message ad nauseum will not have the same result as engaging in meaningful conversation, but this assumes that you understand that the greatest form of discourse takes place within a conversation, and not a lecture or a monologue. 

When you reach that point in your life where the light bulb goes off, and you begin to understand that knowledge is not gained by flapping your lips, but by removing your ear wax, you have taken the first step to becoming a skilled communicator.