When Prime Minister Neville Chamberlain's government fell in May 1940, the nation turned to Churchill. At last, his unique qualities were brought to bear on a supreme challenge, and with his unshakable optimism, his heroic vision, and above all, his splendid speeches, Churchill roused the spirit of the British people.

I'm doing a lot of speaking and talking about habits, which is this subject that obsesses me. That's a lot of fun.

Contemporary research shows that happy people are more altruistic, more productive, more helpful, more likable, more creative, more resilient, more interested in others, friendlier, and healthier. Happy people make better friends, colleagues, and citizens.

The belief that unhappiness is selfless and happiness is selfish is misguided. It's more selfless to act happy. It takes energy, generosity, and discipline to be unfailingly lighthearted, yet everyone takes the happy person for granted. No one is careful of his feelings or tries to keep his spirits high. He seems self-sufficient; he becomes a cushion for others. And because happiness seems unforced, that person usually gets no credit.

Act the way that you want to feel.

Nature is impersonal, awe-inspiring, elegant, eternal. It's geometrically perfect. It's tiny and gigantic. You can travel far to be in a beautiful natural setting, or you can observe it in your backyard - or, in my case, in the trees lining New York City sidewalks, or in the clouds above skyscrapers.

I spend a lot of time saying to myself, "Well, is that really what I like to do? Is that really something that makes me happy?" and letting go of the things that don't make me happy.