In the po-biz, some days you get the lowering clouds and some days, the double rainbow. The trick is to keep sending them out, no matter how discouraging it can be. I've been circulating a manuscript for over two years now, and as it goes out, it evolves, especially if an editor made comments in the process of rejecting it.
Yesterday I went walking after the storm had abated in the early evening, to find myself arched by an enormous, perfectly formed and brilliant double rainbow. I thought of the way one or two acceptances after a long, difficult season of submitting, can restore your faith in your own writing. That faith (and the concomitant persistence) is the key to improving your work. Nice to get such a picturesque reminder!