First let me start off by saying I appreciate your opinion, seems like you actually gave it some thought before posting. Thank you.
Now, as far as the "failure" aspect of the post. It is simple. An individual(as a whole) cannot fail. Anything that is done is only a "failure" if that individual marks it as one.
Talking is selfish because the only thing that could ever come out of the mouth of the individual would be from that individuals "world" so to speak. Whenever you talk, you're either expressing a thought you've had in the past, or a thought your having at the moment your speaking.
Expectations seem to put a certain "preface"(if you will) in the moment you make them(the expectation) as anything that happens thereafter could easily be seen as a mistake as it didn't "line up" with your expectation.
"Personal serenity" - Love how you put that! I believe that's what I'm working towards personally.
Once agian, thank you.