"Whether it's a positive or negative vibration, the Law of Attraction will give you more of the same." -Michael J. Losier
I'm currently reading the book 'Law of Attraction' by Losier and one of the foundational principles is you bring more in of what you put out. For example, if you start the day grumpy, you will find more grumpiness around you.
On the flipside, by being positive, upbeat and energetic, this is what you will find more of. I don't know about you, but to me, it's worth the effort to start on the right side of the bed to find more of that throughout the day.