life principle
A principle, axiom, or piece of insight that is or could become of fundamental importance in or throughout one's life. The most important life principle I ever learned was that a person's health is their most valuable asset. "If you fail to plan, you plan to fail." This life principle has been at the core of my mindset ever since I was a teenager, and it has helped me have a very successful career.
Farlex Dictionary of Idioms. © 2024 Farlex, Inc, all rights reserved.