The true definition of God is as Kabbalah says "Shleimusah Dikulah," the perfection in everything (you see, we live as Einstein discovered in a relative world: fast is not fast… it’s only faster; so if there was nothing slower, fast literally wouldn’t exist (for example, the speed of light is a constant (e=mC-constant) but that constant is only fast because everything else is slower – if it was the only speed, you couldn’t describe it as fast.) As God is not relative, for everything relative must have a comparison (which is why two objects moving can be compared) but as God has no physical qualities, hence I believe the closest we can describe God, is like the infinite ability to imagine – now if your imagination could simultaneously be perfect.