You did everything you were supposed to do. The way you were supposed to do it. You even did it on time. You out your best foot forward, utilized all of your resources, flowed all the rules, and things still didn't turned out as you planned. Well, don't be alarmed, angry, or frustrated, it happens to the best of us. The challenge is to realize and accept that we simply cannot see everything.
All of us have a blind spot, a weak area, a point of vulnerability of which we are simply unaware. There will be those instances in which our best efforts are for naught. When our deepest desire goes in smoke. This will not always mean we did it wrong; it simply means we did not see it right. When we are blindsided by tragedy, disaster, or disappointment, the lesson becomes knowing that our best is always good enough, no matter what the outcome appears to be.