In my study of happiness, I’ve labored to identify its fundamental principles. Because I get a tremendous kick out of the numbered lists that pop up throughout Buddhism (the Triple Refuge, the Noble Eightfold Path, the Four Noble Truths, the eight auspicious symbols), I decided to dub these fundamental principles as my Eight Splendid Truths.

Each one of these truths sounds fairly obvious and straightforward, but each was the product of tremendous thought. Take the Second Splendid Truth—it’s hard to exaggerate the clarity I gained when I finally managed to put it into words. Here they are:

First Splendid Truth

To be happier, you have to think about feeling good, feeling bad, and feeling right, in an atmosphere of growth.

Second Splendid Truth

One of the best ways to make yourself happy is to make other people happy;

One of the best ways to make other people happy is to be happy yourself.

Third Splendid Truth

The days are long, but the years are short. (Click here to see my one-minute movie; of everything I’ve written about happiness, I think this video resonates most with people.)

Fourth Splendid Truth

You’re not happy unless you think you’re happy.

[Many argue the opposite case. John Stuart Mill, for example, wrote, “Ask yourself whether you are happy, and you cease to be so.” I disagree.]

Fifth Splendid Truth

I can build a happy life only on the foundation of my own nature.

Sixth Splendid Truth

The only person I can change is myself.

Seventh Splendid Truth

Happy people make people happy, but

I can’t make someone be happy, and

No one else can make me happy.

Eighth Splendid Truth

Now is now.

Gretchen Rubin is the author of the #1 New York Times Bestseller The Happiness Project—an account of the year she spent test-driving the wisdom of the ages, current scientific studies, and lessons from popular culture about how to be happier—and the recently released Happier at Home and Better Than Before. On her popular blog, The Happiness Project, she reports on her daily adventures in the pursuit of happiness. For more doses of happiness and other happenings, follow Gretchen on Facebook and Twitter.

Image courtesy of nappy.