You can make mistakes, but you aren’t a failure until you start blaming others for those mistakes.
No excuses. I used to struggle with this many, many years ago — especially when I worked in TV/radio sports. It was never my fault when a newscast or radio show went south, or when we missed a big story, or when the ratings weren’t very good. But that, of course, wasn’t true. I think I’m better now at not making excuses and blaming others. It doesn’t accomplish anything.