QA is like cooking, but instead of ingredients, you're working with bugs and user stories. And just as a good soufflé is all about balance, a good QA process is all about finding that sweet spot where bugs are few and far between.
Just as a good chef reads recipes, a good QA person reads code. But not just the code itself, no, no, no. They read the code, and they also read between the lines, looking prophets of functionality and intent.
Or, as we like to say in QA, "Read between the lines, it's like reading between the lines of a good cookbook, but with more bugs."