Think of it as having a &quot;flat file&quot; of facts and some basic tools for deriving one from another. It&#x27;s not the universe of facts that differs, just the hierarchy. Until you have enough knowledge to discern which are fundamental and which are derived, all of the facts have equal stature. That, in turn, allows you to reason from any one point to any other without violating any <i>supposed</i> axioms (which may, on reflection, turn out to have been special case derivations rather than actual axioms). (And the Messenger lectures are publicly available in several places, including YouTube; the one you want is entitled &quot;The Relationship of Mathematics and Physics&quot;.)