This definition from Wikipedia says it best:
An axiom or postulate is a statement that is taken to be true, to serve as a premise or starting point for further reasoning and arguments. The word comes from the Greek axíōma (ἀξίωμα) ‘that which is thought worthy or fit’ or ‘that which commends itself as evident.’
There are a lot of different definitions for Axioms, but for our purposes, the above definition fits best. Our axioms are based on observation and they serve as a starting point for understanding the complexities of the spiritual universe. If future research shows that our axioms are deficient in some regard, they can be amended to serve as a starting point for further reasoning or arguments.
Meanwhile, we will continue to use them until evidence turns up new axioms and this may occur sooner than we expect.
For example, at this moment, we have been considering only our current universe with its rules, agreements and peculiarities, We have not tried to develop axioms for other universes with alternate timelines. We don’t even have any axioms that deal with time yet.
As we discover new axioms, they will be collected here in our archive to serve as a guide to further discoveries.