"How? If God is omniscient, and if God cannot speak a falsehood, then it would follow that when God speaks, "truth is declared from a position of authority"."
The point is that truth is not determined by anyone in authority. The determination of what is true requires that it correspond to reality. It is a judgement call and can be right, or wrong depending on reality as a reference. It is also important to note that God is logical and has free will. It is not correct to say God can not speak a falsehood. It is correct to say that He refuses to.
The point to be made is that just because anyone in particular might make a statement of truth from a position of authority, it is not the position held that determines the truth of the matter. It's how that statement compares with reality and the rules of logic apply.
So in the US, how does logic determine that we should drive on the right side of the road, instead of on the left side of the road?
-A8