"With all its sham, drudgery and broken dreams, it is still a beautiful world." - Max Ehrmann
Simply one of my all time favouraites.
Another good one I found recently which just fit how I was feeling...
"Life's not a song. Llife isn't bliss. Life is just this: it's living"
Not sure who wrote it and I won't say where I got it because I don't want to admit what I was doing when I found it. Google it if you want.