If you do not breathe through writing, if you do not cry out in writing, or sing in writing, then don't write.
You need that conviction that you are brilliant, this is the greatest idea that anybody has ever had, and that by writing it you will set the world on fire.
All drama is conflict. Without conflict, there is no action. Without action, there is no character. Without character, there is no story. And without story, there is no screenplay.
The only thing that makes one an artist is making art. And that requires the precise opposite of hanging out; a deeply lonely and unglamorous task of tolerating oneself long enough to push something out.
The worst enemy of creativity is self-doubt.
Talent is cheaper than table salt. What separates the talented individual from the successful one is a lot of hard work.
Never treat your audience as customers, always as partners.