Using a single basic theme is one method you can employ to guarantee your essay's coherence and effectiveness. It forces you to organize your thoughts and ideas and helps keep the essay focused. Without a theme, your essay will simply look like a haphazard collection of facts thrown together to impress the reader. With a main theme, the essay will have a focal point upon which you will develop the rest of the paragraphs.
Face it there are only so many spots on the roster with the school you may be looking to gain access to. Reviewers will be looking over countless application as well as countless personal statements which allows you a great opportunity to stand out from the rest by writing a statement that is leaps and bounds above the rest. By doing so, you are giving yourself a great leg up on the competition. When you go about employing the fresh eyes others to look over your personal statement before you turn it in, you will be ensuring that your one shot to impress is in fact your best shot.