I've been thinking a lot about mastery lately. Mastering ideas, concepts, or skills, to reach a high level, or new insights.
I think of mastery per se as a worthy goal, but a friend has argued that it can indicate obsession or compulsion, and he thinks high-level mastery is sometimes pathogenic.
Do you have a view on mastery, whether good or bad? For the purposes of this question, let's say mastering that has a neutral impact on the world, like privately learning an idea or skill.