The Echo gives the reader the satisfying sense that you’ve intentionally led them on a journey. It shows that you have been confidently in control of the essay the whole time.
No paragraph in the history of paragraphs receives less attention and respect than the underappreciated conclusion.
The thesis statement gives your reader a clear focus. It, quite simply, states what the essay is about. It doesn’t have to be long, but it does need to be clear.