Generally, when writing a statement of purpose for admission you should be original with your ideas. You are trying to convey the type of person that your are, your research potential, that you will be able to work with them, and how you can contribute to the goals of the school. Express your personality, why you want to study for the degree, your research experience and interests, your
. leadership and communication skills, the various community service and volunteer services performed and add the events and inspirations in your personal life. A sample statement can be found here: http://www.happyschoolsblog.com/sample-sops/