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“Code without tests is bad code. It doesn't matter how well written it is; it doesn't matter how pretty or object-oriented or well-encapsulated it is. With tests, we can change the behavior of our code quickly and verifiably. Without them, we really don't know if our code is getting better or worse.”
― Michael Feathers, Working Effectively with Legacy Code

“Legacy code. The phrase strikes disgust in the hearts of programmers. It conjures images of slogging through a murky swamp of tangled undergrowth with leaches beneath and stinging flies above. It conjures odors of murk, slime, stagnancy, and offal. Although our first joy of programming may have been intense, the misery of dealing with legacy code is often sufficient to extinguish that flame.ï»�”
― Michael Feathers, Working Effectively with Legacy Code

“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