Nasir Khusraw, explains the spiritual interpretation of the tradition of a six day creation of the physical universe. He writes about how the story of creation is a symbolic explanation of what happened when God created the universe. Interpreting it literally is something human beings do based on the limits of their intellects. In the scriptures, when it says that God began the work of creating the world on Sunday, completed it on Friday, and then rested on Saturday, it is not a literal account, rather a symbolic one.