Tell yourself that today is going to be a great day. No matter what happened yesterday, or what you have planned for today, or what you think may happen today, simply tell yourself, "Today is going to be a great day."
Put your whole heart and soul into it. Say it with lots of positive feelings and an absolute belief in the truth of your statement.
This sentence will create a great day for you. I guarantee it. If you're having a bad day, this simple sentence will turn it around. Try it and see what happens!
Excerpted from Magical Mind, Magical Life.