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“All race conditions, deadlock conditions, and concurrent update problems are due to mutable variables.”
― Robert C. Martin, Clean Architecture

“Every dependency is like a little dot of glue that causes your class to stick to the things it touches.”
― Sandi Metz, Practical Object Oriented Design in Ruby

“the fact that oo languages provide safe and convenient polymorphism means that any source code dependency, no matter where it is, can be inverted”
― Robert C. Martin, Clean Architecture