Therefore...
Therefore, true and independent creativity is restricted to God Almighty, and all existents are in need of Him in all their own aspects and in all states and times. It is impossible for an existent to be needless of Him in any of its existential aspects or to be able to do anything independently. This is one of the most brilliant and valuable outcomes of Islamic philosophy, which was presented to the world of philosophy in the blessed and radiant thought of Ṣadr al-Muta’allihīn.
Likewise, philosophers have constructed other demonstrations for unity in creation and lordship which are based on numerous theoretical premises, and in order to prevent prolongation of the discussion, they will be ignored. A demonstration from the Noble Qur’ān will suffice: If there had been in them any gods except Allah, they [i.e. the heavens and earth] would both have certainly been in a state of disorder. (21:22).
This demonstration has been presented in several versions, and among the clearest and closest to the purport of the āyah is the one presented below: This argument is composed of two premises: The existence of every effect is dependent on its own cause. In other words, every effect obtains its existence with all its aspects and associations from its own creative cause. If it needs conditions or preparation their existence must also depend on its creative cause.
Therefore, if two or several creative causes are assumed to be on the same level, the effects of each of them will be dependent on its own cause, and will not possess any sort of dependence on other causes or on their effects. In this way, there will be no relation or dependence among their effects.
The design of the observable world (the heavens and the earth and their phenomena) is a single design in which all phenomena, whether they are simultaneous or not, are related and dependent on each other. The relations among simultaneous phenomena are various mutual causal influences which cause changes and alterations in them, and these are absolutely undeniable.
The relations among the phenomena of the past, present and future are such that the past phenomena prepare the ground for the appearance of the present phenomena, and the present phenomena, in turn, prepare the ground for the appearance of future phenomena. If the causal and preparatory relations among the phenomena of the cosmos were removed, no cosmos would remain at all, and no other phenomena could take place.