What scripture or writing sums up your personal belief of spirituality?

"Say: we believe in God and in what has been revealed to us, and what was revealed to Abraham, Isma'il: Isaac, Jacob and The Tribes, and in (the Books) given to Moses, Jesus and the Prophets, from their Lord: We make no distinction between one and another, among them, and to God do we bow our will (in Islam)." (Qur'an, Al-Imran 3:84)