What do you do if you have the will and the drive for words, but the well of ideas has run dry? Many of the ideas you contemplate are already written down by someone else, and they've accomplished this feat far more competently than you ever might have. Soon, you stagnate. I can just imagine a puddle of still water in the middle of the road following a brief shower getting stomped on by neighborhood kids. The water goes stale. It just lays there and waits for evaporation.
The most agitating advice for pen-blocked writer is "Write what you know." What if you don't care about what you know? What if what you know is uninteresting? Or what if you strive to attain Socrates' wisdom by acknowledging that "I know that I know nothing"?
Then I was gifted with the best advice that anyone could possibly receive:
"Shut the fuck up and just write." It doesn't matter what you write, it doesn't matter who reads it, it doesn't matter if it lasts throughout the ages like a tale from Shakespeare or Homer, it doesn't matter if you like it, it doesn't matter if other people like it. If you write enough, you're bound to come up with at least one diamond in the mess of worthless pebbles. If you don't, do not despair: the process is what matters most. Just enjoy yourself. If you're not enjoying yourself, then get the fuck out of it and find something that you do enjoy.
