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.

The absence of feeling bad isn't enough to make you happy; you must strive to find sources of feeling good

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.

Act the way you WANT to feel.

No one regrets having changed a lightbulb.

Happiness is a critical factor for work, and work is a critical factor for happiness. In one of those life-isn’t-fair results, it turns out that the happy out-perform the less happy.

Happiness comes not from having more, not from having less, but from wanting what you have.