Well I suppose I'd write about where I am in my life, what happened in the past to get me here and where I see myself in the future.
I'd definitely mention important things in my life such as God, family, and friends, and any interests that I have.
Also, I'd mention how I'm constanting learning in everyday life and then do something like quote a philospher and then go on to say that I've understood that theory and see how it applies to my life and the society that I live in and how in turn, that goes on to affect me...and then explain how that is a never ending cycle, as how other things in life are too (ex. food web).
Are you following?