No writing is wasted. Did you know that sourdough from San Francisco is leavened partly by a bacteria called lactobacillus sanfrancisensis? It is native to the soil there, and does not do well elsewhere. But any kitchen can become an ecosystem. If you bake a lot, your kitchen will become a happy home to wild yeasts, and all your bread will taste better. Even a failed loaf is not wasted. Likewise, cheese makers wash the dairy floor with whey. Tomato gardeners compost with rotten tomatoes. No writing is wasted: the words you can't put in your book can wash the floor, live in the soil, lurk around in the air. They will make the next words better.
... The Book is more important than your plans for it. You have to go with what works for The Book ~ if your ideas appear hollow or forced when they are put on paper, chop them, erase them, pulverise them and start again. Don't whine when things are not going your way, because they are going the right way for The Book, which is more important. The show must go on, and so must The Book.
I don't think anybody can teach anybody anything. I think that you learn it, but the young writer that is as I say demon-driven and wants to learn and has got to write, he don't know why, he will learn from almost any source that he finds. He will learn from older people who are not writers, he will learn from writers, but he learns it -- you can't teach it.
Becoming a writer is about becoming conscious. When you're conscious and writing from a place of insight and simplicity and real caring about the truth, you have the ability to throw the lights on for your reader. He or she will recognize his or her life and truth in what you say, in the pictures you have painted, and this decreases the terrible sense of isolation that we have all had too much of.
Let the writer take up surgery or bricklaying if he is interested in technique. There is no mechanical way to get the writing done, no shortcut. The young writer would be a fool to follow a theory. Teach yourself by your own mistakes; people learn only by error. The good artist believes that nobody is good enough to give him advice. He has supreme vanity. No matter how much he admires the old writer, he wants to beat him.
Fiction---good fiction, anyway---is dream made flesh, given purpose and drive, and set on a quest to show us the best in us and to give us the power and the tools to dream beyond reality's 'merely good enough' to a vision of what is truly great......and then to give us the stories of men and women of character who in turn inspire those of us who dare to reach for the truly great within ourselves.THAT is why you write fiction.