True Grit

via Farnam Street

We speculate that individual differences in the intensity dimension of effort are salient and, therefore, described by many adjectives in the English language (e.g., energetic, conscientious, dutiful, responsible, lazy). Whereas the amount of energy one invests in a particular task at a given moment in time is readily apparent both to oneself and to others, the consistency of one’s long-term goals and the stamina with which one pursues those goals over years may be less obvious. Similarly, whereas the importance of working harder is easily apprehended, the importance of working longer without switching objectives may be less perceptible.

总结一下：什么难练习什么，坚持做很久很久  (isolate the most difficult part and keep correcting them with deliberate practice)