Principles

Ray Dalio wrote in the section of Introduction of his "Princples" as follows:

Principles are ways of successfully dealing with the laws of nature or the laws of life. Those who understand more of them and understand them well know how to interact with the world more effectively than those who know fewer of them or know them less well.

(snip)

... when digesting each principle, please...

...ask yourself: "Is it true?"