The Rumi Collection
Edited by Kabir Helminski

I like Rumi, who was a poet and practitioner of Sufism (a mystical branch of Islam), because his writing is very spiritual. He doesn't hit you over the head with the tenets of a specific religion, but he introduces God in almost every passage. One statement I live by is 'If you are irritated by every rub, how will your mirror be polished?' It's a great reminder that if you can't get up and dust yourself off after a disappointment, then how will you be made better?