We read in the Qur'an that all comes from God and all returns to Him. In philosophical terms one can simply say that all comes from spirit and will return to it. No substance can exist without spirit. Although there is a war between spirit and substance, although they are opposed to each other, at the same time no substance can ever exist without spirit. Throughout this battle between substance and spirit the substance will resist spirit and outwardly drive it away, resisting surrender or diminution by the power of the spirit. But there will come a day when it will be diminished; in other words there is no mountain which will not one day crumble.