"Is there a happiness mantra or motto that you’ve found very helpful?"

This was referenced on Althouse where today's theme is happiness. The question was originally asked of John Tierney over at a blog called The Happiness Project. Tierney's answer is a good one:

Years ago, when I was researching an article on research into stress, one social scientist passed on a simple tip: “At some point every day, you have to say, ‘No more work.’” No matter how many tasks remain undone, you have to relax at some point and enjoy the evening. 

My own was something I found in article in Esquire in the early 1990s about stress. The line that really helped me was this:

Stress isn't the car that cuts you off on the highway, it's your reaction to it.