“One of the best ways to make yourself happy in the present is to recall happy times from the past. Photos are a great memory-prompt, and because we tend to take photos of happy occasions, they weight our memories to the good.”

“Negative emotions like loneliness, envy, and guilt have an important role to play in a happy life; they're big, flashing signs that something needs to change.”

“Whenever I start a new book, I think, 'This is the most interesting subject of all time. It's sad, I'll never enjoy writing another book as much as I enjoy this one.' Every time, I'm convinced. And then I change my mind when I start the next book.”

“People are powerfully moved by imagination, belief, and knowledge. They can consider the past and future. They can make changes in their behavior out of reason in a way that animals can't do.”

“One of my key realizations about happiness, and a point oddly under-emphasized by positive psychologists, given its emphasis in popular culture, is that outer order contributes to inner calm. More than it should.”

“Skillful conversationalists can explore disagreements and make points in ways that feel constructive and positive rather than combative or corrective.”

“Work done by other people sounds easy. How hard can it be to take care of a newborn who sleeps 20 hours a day? How hard can it be to keep track of your billable hours? To travel for one night for business? To get a 4-year-old ready for school? To return a few phone calls? To load the dishwasher? To fill out some forms?”

“Enthusiasm is a form of social courage.”

“Like most people, I have several pet subjects - that may or may not be interesting to other people. Don't get me started on happiness, or habits, or children's literature, or Winston Churchill, unless you really want to talk about it.”

“Turn off your email; turn off your phone; disconnect from the Internet; figure out a way to set limits so you can concentrate when you need to, and disengage when you need to. Technology is a good servant but a bad master.”

“We can use decision-making to choose the habits we want to form, use willpower to get the habit started, then - and this is the best part - we can allow the extraordinary power of habit to take over. At that point, we're free from the need to decide and the need to use willpower.”