How hard will you try? How much disappointment and discouragement are you willing to tolerate on your journey to becoming a good writer? And how much criticism are you willing to hear, from others and from yourself?
In short, how much punishment are you willing to absorb?
People are born with varying amounts of talent. But we all can choose our actions and our habits. We can choose the number of hours we put into writing. We can choose whether we let criticism or disappointment stop us. We can choose whether we allow ourselves to quit.
Very few people are truly prepared to own these choices. But our choices, and the extent to which we take responsibility for them, determine whether we become successful writers--or failed ones.