Be still when you have nothing to say; when genuine passion moves you, say what you've got to say, and say it hot. ~~ D.H. LawrenceWhen you have a deadline for your writing, you may have to force your way through a period when you have nothing to say. On the whole, your best writing will come when you have passion for your topic or for your story and you capitalize on that passion by, as D.H. Lawrence says it, saying it hot.
There's nothing better than writing when in the grips of your topic or story.... when you feel the story and all the emotions that go with it. Sometimes it worth it to say nothing for a while and quietly wait for that genuine passion to move you.