People ask me all the time what the secret to happiness is. “If you had to pick just one thing,” they wonder, “what would be the most important thing for leading a happy life?”

Ten years ago, I would have told you a regular gratitude practice was the most important thing—and while that is still my favorite instant happiness booster, my answer has changed. I believe the most important thing for happiness is living truthfully. Here’s the specific advice I recently gave my kids:

Live with total integrity. Be transparent, honest, and authentic. Do not ever waiver from this; white lies and false smiles quickly snowball into a life lived out of alignment. It is better to be yourself and risk having people not like you than to suffer the stress and tension that comes from pretending to be someone you’re not, or professing to like something that you don’t…