Years of intensive Stone Age original etymological investigation of the very ancient origins of English appears to indicate it has two integrated origins, not one. Each can be studied independently but neither would function on its own as they were united for tens of thousands of years.
English is not a collection of words but a family of linguistic clusters each distinct from the other but all of them constitute a nation of speech conveying certain elements of a story we need to know to understand our history and ourselves. Only when they are under a single lexical category does it become much easier to relate and understand.
It is a linguistic jigsaw puzzle, if you wish, but the benefits are many and worth the effort. Whether we are aware or not, our speech contains everything important that occurred perhaps in the last 100,000 years, or even much more. There are no secrets because we have words for everything but we need to identify them and understand the information they convey. This can be accomplished by allowing the words to tell us what they mean and not relying on texts that tell us what writers think or chose to tell.