Conceptions of God in monotheist, pantheist, and panentheist religions – or of the supreme deity in henotheistic religions – can extend to various levels of abstraction:
as a powerful, personal, supernatural being, or as the deification of an esoteric, mystical or philosophical entity or category;
as the "Ultimate", the summum bonum, the "Absolute Infinite", the "Transcendent", or Existence or Being itself;
as the ground of being, the monistic substrate, that which we cannot understand; and so on.
The first recordings that survive of monotheistic conceptions of God, borne out of henotheism and (mostly in Eastern religions) monism, are from the Hellenistic period. Of the many objects and entities that religions and other belief systems across the ages have labeled as divine, the one criterion they share is their acknowledgment as divine by a group or groups of human beings.
Aristotelian view of God
In his Metaphysics, Aristotle discusses the meaning of "being as being". Aristotle holds that "being" primarily refers to the Unmoved Movers, and assigned one of these to each movement in the heavens. Each Unmoved Mover continuously contemplates its own contemplation, and everything that fits the second meaning of "being" by having its source of motion in itself, i.e., moves because the knowledge of its Mover causes it to emulate this Mover (or should).
Aristotle's definition of God attributes perfection to this being, and, as a perfect being, it can only contemplate upon perfection and not on imperfection; otherwise perfection would not be one of his attributes. God, according to Aristotle, is in a state of "stasis" untouched by change and imperfection. The "unmoved mover" is very unlike the conception of God that one sees in most religions. It has been likened to a person who is playing dominos and pushes one of them over, so that every other domino in the set is pushed over as well, without the being having to do anything about it.