The subtext of this message is to disassociate your sense of self from your abilities. There is a great quote in one of the "Little Bear" children's books that I would read to my kids when they were toddlers, Little Bear is explaining that he knows how to fly, but so far he has only mastered flying straight down.
It is hard to be 'Ok' with yourself not being able to do something you perceive as 'easy.' Or worse when someone you consider to be less talented than yourself is better at something than you, its hard to internalize that too. But all of these stem from the notion that your own value is determined by what you can do. That notion gets in the way of getting better at things.