> an engineer to fully understand the form and function of a piece of code Which is quite impossible. This kind of understanding is a bunch of mental levers, t

> an engineer to fully understand the form and function of a piece of code Which is quite impossible. This kind of understanding is a bunch of mental levers, trying to Nicolas Cage every possible scenario to a piece of code. That's why we have ideas such as clean code and TDD - to ensure that we don't have to fully understand the form and function of a piece of code. Instead, we can be humans, worry about the general design, and allow machines to validate it.