(there's even a Dr. Who episode in which that pronouncement was fatal...but I digress).
As players, we need to evaluate ourselves in order to improve. Here's an idea: play a one- or two-octave scale in eighth notes...not too fast. If you have a machine handy, record yourself. After playing it (or listening back), instead of asking yourself was it good or bad, ask yourself, "Which note was the weakest link?" Inevitably, some notes will be better and some weaker.
Learn to evaluate yourself comparatively.
It is healthy to also ask yourself, "Which notes were the strongest links?" No matter what your level, when you play something, it will have a mixture of better moments and weaker moments.
Why did the better moments sound better?
When I record a student and, at one moment, they sound much better, I like to ask, "Did you hear that? That was really great. Why did it sound so much better there?"
Their usual replies..
- I took a better breath.
- I started to relax.
- I don't know, I just really enjoy playing that part.