A statement can be defined as true only within the limits of a certain system. There can be an infinite number of systems. Which in themselves can produce an infinite number of true statements. For example within mathematics.
Each system is a subsystem (or rather a part) of reality. Therefore no system is able to make a true statement about the nature of reality. The infinite nature of reality always escapes any set number of rules.
Further, each statement about reality is made from a certain, finite point of view within infinite reality. The search for an ultimately true statement always reveals it's own tool or mechanism by which it tries to define reality as inadequate and illusory.
Truth is undefinable. No statement can ultimately be made about it. That's why it is so difficult to talk about enlightenment.