Looking back now, I would say that this was one of the first valuable lessons I learned, and one that would be useful in my future line of work. Sometimes things go wrong. It is inevitable. But it is a mistake to waste time and energy worrying about events that you cannot influence. Once they have happened, let them go.
Anthony Horowitz, Russian Roulette: The Story of an Assassin
experience, learning, mistakes, moving-on-and-letting-go, wisdom