Seeking inspiring/upbeat advice or observations on writer rejection for my book

As some of you already know, I'm working on a book that is both a compilation of my writer comics as well as nuggets of writerly wisdom I've found in blogs, organized by topic. I don't have a contract yet, but I'm confident enough in its saleability that I've started putting it together anyway.

The chapter I'm working on now: REJECTION.

If you've written a blog post on rejection that you think might contain some quotable advice or observation, please do post the URL in the comments below...