You may have already noticed but I find quotes really inspirational and motivating. I have recently printed quite a few from my laptop and placed them on my board above my desk to help me. You should maybe try it too, really helps if you're really down and brings a smile back onto your face. My favorite is from a teacher who wrote it in my leaving book when I left school, this was 6 years ago and has stuck in my head ever since.
"Believe in yourself, then you can do anything"