Elon Musk recently said it well. He said something along the lines of always assuming you are wrong. The goal is to try to be less wrong all the time. Which is basically what good science is. And that guarantees long term improvement and success. So you need to fail a little to learn and get better. If you always succeeded, I think you'd never really know why you succeeded which is important knowledge and guarantees to a certain degree not making those mistakes again in the future.