“JE NE REGRETTE RIEN,” sang Edith Piaf plaintively. “Formidable,” she exclaimed when she first heard it, “this is the song I have been waiting for. It will be my biggest success!” And so it was.

For good reason. We all make mistakes. We all say things we wish we could take back, and do things we wish we could undo. And that’s all very well, as long as we can learn from our mistakes and move on.

But don’t regret anything in your past, because your past is what made you who you are today. Regret is the most corrosive emotion: it eats away at you without achieving anything of value. Move on, move on.