One of life’s certainties is that you will make mistakes. You can’t stop it. If you can’t stop something, then you accept it. But acceptance isn’t enough. What is needed is learning. We need to learn from our mistakes. What went wrong, and why? You should ask yourself those two questions when you err.
One way to compound a mistake is to turn into chicken little. You made one mistake, that doesn’t mean you will make another. So if you have a strategy, say for your finances, and you make a mistake along the way, don’t change your philosophy because you made a mistake. Stick with your strategy if you believe it’s the right one.