Number four is: fake it till you feel it. By the end of the project, I was just in a thanking frenzy. So I was — I would get up and spend a couple hours, I'd write emails, send notes, make phone calls, visit people to thank them for their role in my coffee. And some of them, quite honestly — not that into it. They would be like, "What is this? Is this a pyramid scheme, what do you want, what are you selling?" But most people were surprisingly moved. I remember, I called the woman who does the pest control for the warehouse where my coffee is served — I'm sorry — where my coffee is stored. And I said, "This may sound strange, but I want to thank you for keeping the bugs out of my coffee." And she said, "Well, that does sound strange, but you just made my day." And it was like an anti-crank phone call. And it didn't just affect her, it affected me. Because I would wake up every morning in my default mood, which is grumpiness, but I would force myself to write a thank-you note and then another and then another. And what I found was that if you act as if you're grateful, you eventually become grateful for real. The power of our actions to change our mind is astounding. So, often we think that thought changes behavior, but behavior very often changes our thought.