Happiness is hard because it's very subjective. I know the people that seem happiest to me, but whether they are actually - what they're really like inside is really hard to say.

No one regrets having changed a lightbulb.

Act the way that you want to feel.

Often, if there's something that I want to do, but somehow can't get myself to do, it's because I don't have clarity. This lack of clarity often arises from a feeling of ambivalence - I want to do something, but I don't want to do it; or I want one thing, but I also want something else that conflicts with it.

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, were free from the need to decide and the need to use willpower.

Forbearance is a form of generosity.

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.