I had to share Hemingway's answer to this question from The Paris Review Interviews Vol. 1 (pg 42):
What would you consider the best intellectual training for the would-be writer?
Let's say that he should go out and hang himself because he finds that writing well is impossibly difficult. Then he should be cut down without mercy and forced by his own self to write as well as he can for the rest of his life. At least he will have the story of the hanging to commence with.
What? He is my hero. I'm still trying to wrap my head around this, but I'm pretty sure it means that Hemingway is genius.