Gavin is a freelance cartoonist who created a cartoon blog that adapts inspirational quotes into comic stories. His website is generous (freebies) and his work is in itself inspiring see: http://zenpencils.com
I love this particular poster because I think one of the greatest and hardest things I have to do to take care of myself is believe in myself. It reads:
Men (and women) often become what they believe themselves to be
If I believe I cannot do something
It makes me incapable of doing it
But when I believe I can
Then I acquire the ability to do it
Even if I didn't have it in the beginning.