There are in fact three grand revelations: the cosmos, the human state, and religions — all three of which Islam sees as "books." There is, first of all, the cosmic book to be read and deciphered. Then there is the inner book of the soul, which we carry within ourselves. And finally, there are the sacred scriptures which have been sent by God through His Mercy to guide humanity throughout the ages and which are the foundations of various religions and keys for reading the other two books, that of the cosmos and that of the soul.
— Seyyed Hossein Nasr, The Heart of Islam