Those words once spoken by Karl Lagerfeld were said in scorn of an ex-friend. It was more about leaving people behind and making them completely irrelevant. That’s one way to practice the art of forgetting.
But there’s a more positive, less bitter way: forgetting (or moving on from) your mistakes.
Of course, you don’t ignore your failures; you learn from them. But at one point, you have to forget that you’ve failed in the past and move on with some confidence in your next action. That’s hard, especially when it feels good to victimize and pity yourself from being so shitty.
So forget about your shitty past enough to move on. Forgetting purifies.