I have one that I use for work, but I can't seem to find it from home. Just do a search for motivational quotes and you'll receive a lot of hits.
My advise is that before you put it in you newsletter, check the author. Some can be not too political correct, even if the quotes sound like something you would want to use.
I was wondering if anyone has any websites they would like to share where I can get some quotes about children, education, volunteering, involvement etc. I would like to include some in our newsleters this school year. Even if you don't have a website feel free to share a quote that you have used or was thinking about. Thanks guys- you are all very helpful!!!