nothing more than what it is and nothing less than it should be

Its something you say when someone is questioning something they shouldnt be. In other words Everything went the way it should have.

Phil: Why were you gone 10 minutes too long or Why you back so quick, what did you do?
Stacy: I dd what I was supposed to do .. IT'S NOTHING MORE THAN WHAT IT IS AND NOTHING LESS THAN IT SHOULD BE!