Slushkiller
100% must-read. It's an article about the thought process behind rejection letters; it's about writing.

Anyway, as I was saying, it realio trulio honestly isn’t about you the writer per se. If you got rejected, it wasn’t because we think you’re an inadequate human being. We just don’t want to buy your book. To tell you the truth, chances are we didn’t even register your existence as a unique and individual human being. You know your heart and soul are stapled to that manuscript, but what we see are the words on the paper. And that’s as it should be, because when readers buy our books, the words on the paper are what they get.

This all becomes clearer if you think about it with your reader-mind instead of your author-mind. Authors with books are like mothers with infants: theirs is the center of the universe, uniquely wonderful, and will inevitably and infallibly be loved by all who make its acquaintance. This has its good aspects; books, like infants, need someone to unconditionally love them, and champion all their causes. On the other hand, it can be a form of blindness.

Your reader-mind has a different understanding of the whole book thing. Your reader-mind knows what it’s like to walk into a bookstore, or a Costco, or a Target, and confront a wire rack the size of your living-room wall, with slot after slot filled with books. At that moment, standing there in front of that rack, you don’t much care about encouraging new writers, or helping create a more diverse literary scene, or giving some author a chance to express herself. You want a book that will please you, and suit your needs, and do it right now. Dear reader, you are many things, but “gentle” isn’t one of them.