I wouldn't agree with this summary. I think he was saying 1) Expertise is relative. His example included the temporal nature of the "cutting-edge" in computin

I wouldn't agree with this summary. I think he was saying 1) Expertise is relative. His example included the temporal nature of the "cutting-edge" in computing. What was consider best practice 10 years ago is no longer considered even ok. 2) Achieve things by setting an actionable next step instead of a goal of becoming an "expert" A next step e.g. getting a patch into Rails Core will move you forward, trying to be an "expert" cause you to do things which make you an expert in the eyes of others. I.e. you'll work to fulfill the definition in 1)