My understanding of the word Duality is for the character of SINGULAR GOD.
It is absolutly clear there is ONE GOD only.Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/controversies/38450-gods-almightyness-versus-evil.html
I refer to the character of this SINGULAR GOD as Duality.Two opposite characteristics
existing together within ONE is Duality.Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=38450
In this reference if SINGULAR GOD is said to be existing everywhere so is the Duality.