There are two sides to mastery: the good and the ugly.
The good side of mastery is something to strive for: be a perfectionist, dedicate yourself to a task, do something to be proud of.
But mastery is a whole different thing for those who think they know (or are) better. This sort of “mastery” begets narrow-mindedness and petty rigidity.
Read MoreKnowing enough to think you are right, but not knowing enough to know you are wrong.”
—Neil deGrasse Tyson