I know personally I need a reminder of this well.....every morning. So as I sit on the bus headed to work, I drink my coffee and set a goal for the day. I usually try to make it a small goal and I make it very specific (i.e. "Have more patience with (enter student's name).", "Email a parent and tell them something great their child accomplished that day." etc.). This positive thinking in the morning really can change a whole day.
Don't worry everyone, I won't try and get this deep with you every Monday :)