Generally, keep in mind that the points about your life that you highlight should be somehow relevant to both your own interest in the field of study, as well as to the concerns of the admissions committee. In judging what information to include or exclude from your essay, try to balance academic, work-related, and personal information in a manner appropriate to your situation, goals, and the application requirements.
The information that could be included in a personal-type statement is limited only by your own imagination and life history, but you should be highly selective about what you include. There are two things to watch out for: (1) saying too much and/or (2) not saying enough.
application essay, why not include a quote or ..
The overall application package will represent who "you" are to people whom you will most likely not know personally. The written expression of your qualities as an applicant will often be a very important way for committee members to get to know why you are an acceptable candidate for their program. Thus, it is essential to take great care in preparing this part of your application. Because graduate schools make important selection decisions that are partly based on what you say in this essay, the writing of it can be an intimidating prospect.