There are no rules to writing a mission statement... for some, it's a series of statements- like what you would see a business develop. And example could be:
I want to impact someone's life for the better and live with passion each day. I make decisions based on kindness. I want to be genuine in all of my actions. I will not lose sight of who I am in order to move forward in my career. It is important to me to do the right thing for others.
If that isn't up your alley, you could go for having a mantra - this is more of a general saying, concept or quote that represents what you believe in. 'Carpe Diem, seize the day', 'Life is meant to be lived with passion each day'. You could also have a collection of those ideas - such at what lululemon athletica has as their 'manifesto' - http://www.lululemon.com/about/manifesto
There are no rules for writing your mission or your mantra. It should appear organically. It's what you are about... while you may go back and revise this over your entire life, it should come naturally to you right now - it's what you believe in. If you aren't sure what you believe in, spend some time in thought over the next day wrestling with that and then come back to this dare.
When you are ready - put pen to paper and put down your mission or mantra statement. Post to the 30 Day Challenge Facebook page if you like - we'd love to see it. http://www.facebook.com/pages/30-Day-Happy-Life-Challenge/349602101746804?sk=wall
Let that mission or mantra be a reminder of what you are about - let it guide you when times are confusing, and let it be what you stick to when things are changing all around you. Your mantra or your mission are your brand - what make you you. And you are an amazing you. So celebrate your amazingness with creating your mission or mantra. We can't wait to read it!