Found it.
I think someone has already discussed this but Truth is absolute. Since you say that God is the source and reference point then automatically God is the absolute truth because He is the source. Peace.
You may think I am being pendantic, but this relates to one word, self-perception.
It can be shown everything we believe or experience is subjective, it is bounded by who we are, how we perceive the world, and out past memories of knowledge and what we have been a part of.
Science limited knowledge to things that should be shown to happen through controlled experiments, which have a predictable outcome. This has been further refined to we can say what something is not, better than a complete description of what is.
Now this understanding makes us humble, and limits our certainty to what it actually is, belief.
And worse still if we construct for ourselves a wrong model or belief we can be convinced it is true, while ignoring the very things that show it is false.
Now we can project that outside ourselves truth exists, which we observe and can believe our understanding of it is correct.
In these discussions some believe doubt is evil and wrong, rather than doubt is about testing the limitations of our experiences. It is why we are called to test things, to be aware things can come at us appearing to be fine, but when looked at slightly differently, shown to be a deception or miss leading.
This perception is called critical thinking, and is foundational to the christian faith and God.
Now people who want to defend their position often use terms like absolute, to avoid the fear that others might show it up by a different perspective. This is why I do not like the term absolute and its history in human thought has not been a good one. You only find absolute to be used in terms of complete refusal or complete purity in scripture.
Now for some this is not black and white enough, but then walking with the Lord is more complex, as these threads demonstrate.