Ever tried. Ever failed. No matter. Fail again. Fail better.
~Samuel Beckett

Probably, indeed, the larger part of the labor of an author composing his work is critical labor; the labor of sifting, combining, constructing, expunging, correcting, testing. This frightful toil is as much critical as creative.
~T.S. Eliot

The real secret of magic is that the world is made of words, and that if you know the words that the world is made of you can make of it whatever you wish. ~Terence McKenna

Tell the readers a story! Because without a story, you are merely using words to prove you can string them together in logical sentences.
~Anne McCaffrey

The beautiful part of writing is that you don't have to get it right the first time, unlike, say, a brain surgeon.
~Robert Cormier

If you don't feel that you are possibly on the edge of humiliating yourself, of losing control of the whole thing, then probably what you are doing isn't very vital. If you don't feel like you are writing somewhat over your head, why do it? If you don't have some doubt of your authority to tell this story, then you are not trying to tell enough.
~ John Irving

Sometimes making stuff up feels a lot like Coyote* running across the empty space between one rocky pinnacle and the next, and as long as you keep moving you're fine. When you stop and look down, it's suddenly all too apparent that there's absolutely nothing underneath and that you're keeping in the air by a peculiar effort of will.

And then a good day comes, and you start running through the air once again, and, if you're smart, you resolutely don't look down. ~Neil Gaiman