To be a successful communicator, think of your listener first, and focus on attention.
Communication is hard. To successfully convey information requires taking what's in my head and getting it into yours in some reasonable facsimile of the original thought or idea. If you think this is easy, just remember the last time you tried to inform a group of individuals about an upcoming change – and then remember the many (sometimes baffling) concerns and rumors that arose as a result!
As George Bernard Shaw once said, “The single biggest problem in communication is the illusion that is has taken place." That's because most of us focus only on the front end of the communication process – the part that's all about us: the information we want to convey (the message) and how we plan to convey it (the medium).