Tennessee Williams

I believe the way to write a good play is to convince yourself it is easy to do--then go ahead and do it with ease. Don't maul, don't suffer, don't groan till the first draft is finished. A play is a phoenix and it dies a thousand deaths. Usually at night. In the morning it springs up again from its ashes and crows like a happy rooster. It is never as bad as you think, it is never as good. It is somewhere in between, and success or failure depends on which end of your emotional gamut concerning its value it approaches more closely. But it is much more likely to be good if you think it is wonderful while you are writing the first draft. An artist must believe in himself. Your belief is contagious. Others may say he is vain, but they are affected.
-Tennessee Williams, Notebooks