From the Preface of "Clean Architecture"
“…The rules of software architecture are the rules of ordering and assembling the building blocks of programs. And since those building blocks are universal and haven’t changed, the rules for ordering them are likewise universal and changeless.
But one thing has changed: Back then, we didn’t know what the rules were. Consequently, we broke them, over and over again. Now, with half a century of experience behind us, we have a grasp of those rules.
And it is those rules—those timeless, changeless, rules—that this book is all about.”
— Robert C. "Uncle Bob" Martin