A personal statement is about you. It isn't about Einstein, Plato, Aristotle, Wittgenstein or any of the other random people applicants enjoy quoting in their personal statement. I've seen hundreds and hundreds of them and I'm yet to see one starting with a quote which is actually any good and the quote was a useful use of characters. Aristotle is not applying for your place at university so the admissions tutors do not care what he happened to say about the law, they only care about what you think about law and why you want to study it at university.
Similarly, they also do not care as to whether you've loved law and been destined to study it at university since the age of five when you were "reading" the aforementioned Aristotle text. They couldn't care less if you'd decided to study it yesterday as long as you had a concrete argument about why you did want to study it. Its unrealistic that aged 5 you were even aware of what the law was, let alone that you planned to study it at university, so why try and pretend that it is the case?