"Mistakes were made."
This is a phrase that has been spoken countless times throughout history, usually when a speaker is trying to distance themselves from actions and their consequences. Of course, if you do make a mistake, the best course of action is to take responsibility, correct it, and improve.
This isn't always easy, but sometimes, it's as simple as understanding where you went wrong, why it matters, and what you should change. In that case, there's no reason not to jump right on it,[...]