To write without pay until somebody offers pay. If nobody offers pay within three years, the candidate may look upon this circumstance with the most implicit confidence as the sign that sawing wood is what he was intended for.
Any magazine-cover hack can splash paint around wildly and call it a nightmare, or a witches sabbath or a portrait of the devil; but only a great painter can make such a thing really scare or ring true. That's because only a real artist knows the anatomy of the terrible, or the physiology of fear.
One of the problems we have as writers is we don't take ourselves seriously while writing; being serious is setting aside a time and saying if it comes, good; if it doesn't come, good, I'll just sit here.
I believe that basically you write for two people; yourself to try to make it absolutely perfect; or if not that then wonderful. Then you write for who you love whether she can read or write or not and whether she is alive or dead.
The further you go in writing the more alone you are. Most of your best and oldest friends die. Others move away. You do not see them except rarely, but you write and have much the same contact with them as though you were together at the café in the old days. You exchange comic, sometimes cheerfully obscene and irresponsible letters, and it is almost as good as talking. But you are more alone because that is how you must work and the time to work is shorter all the time and if you waste it you feel you have committed a sin for which there is no forgiveness.