What you call truth
The Gospel, or the word as some may call it is like a universal code that gives form to everything that exists.
It writes the beginning and the end of all in accordance to the laws set forth by the light. The light being a god figure in every sense that matters. It is thanks to this code that the book of Time came to be(The Reality Of The Rulers).
If you can read the code then you can write it down, right? But no living being can do that, in a sense it doesn't even exist, it's like the air you breathe. It can't be recognized by anyone except for he who created it.
However, as not every rule can be followed, there are sometimes glitches in this code. Now this is where things get interesting.