Speaking at Unity Church of Yucaipa on January 1, 2012

I just found out on Sunday, I will be filling in for our minster at the Unity Church of Yucaipa on January 1, 2012. This will be the first time I have spoken at a church during a service. I am really looking forward to it!  Any ideas, what would be good speech to share with congregation.
Just email me?
Carlos Samaniego