2 CORINTHIANS 12:2-10
The root word of axiomatic, axiom—a self-evident truth—comes from the Greek axioma, meaning "authority”. We use it to describe compact, often pithy statements that have the authority of truth about them.
For example, “Out of sight, out of mind” is axiomatic because we all know it experientially as true. “Familiarity breeds contempt” is too.
It’s the latter Jesus confronts in this week’s Gospel reading, and he does it with an axiom of his own.