Please, DO NOT use quotes- especially to start the piece. The way Profesh does it is okay i suppose, but to put a quote at the beginning is, according to King's College lecturers, and the admissions tutor's at Oxford, very cheesy. I went to an Oxbridge day when i was considering going there last year, and the admissions guy said that hundreds of people start with a quote, and they find it eye-rolling. He said some of them are so cheesy that they even laugh out loud.
Just try to be innovative, clever, and funny, and you'll be fine. I have to say, my personal statemnet couldn't be further from Profesh's, and i got my offers fine. Didn't use any big words, was plain and honest, and it really showed my passion for learning Law. Don't start with a quote.