In our previous discussion it was proven that the existence of God is limitless. Now we say that there can be no duality in such truth and He is definite One because we have repeatedly understood that two entities cannot be limitless or infinite at the same time because duality demands limitations. It is clear that when we image two entities one has a separate existence from the other and will end at some point and from there will begin the existence of the other.
We can clarify this through a very simple illustration. You image a light which shines with limitations of boundaries and is limitless from all sides. Can you imagine a similar light at the same time? Never! The light that we imagine will be the first but we will add limitations to it and then say it comes from such and is at such a place.
In other words we can say the they both exist in the manifest and if their time, age and place, and station are two or their source of origin are different or the light from is greater than the light of the other but if they are bereft of all these conditions then we will consider them not as two but as one. Verse 117 of Surah Muminun says, Who ever invokes any besides God having no proof thereof, will have his reckoning with his Lord; verily the disbelieves shall never succeed.”
This verse may be referring that taking partners for God is not worth any proof so have you build a proof on it when this is totally unacceptable.