From the recent interview with Lynda Weinman, founder of Lynda.com:
To be a good artist, you must be critical. You don't have to save it all.
Here she was referring to her new 3D printed pottery work. However, she did go on to say this advice can apply to careers and career focus.
As she explained, sometimes you make a mistake, or you make something that’s not terribly awesome. Learn from what happened and let it go. Move on.
Many people let mistakes keep them from moving forward in their field. They obsess over the thing they did wrong, rather than figuring out the lessons in what to avoid or improve next time.
You don’t have to save it all. It’s ok to throw it out and move on.