I think self-knowledge is a key to happiness.We can build happy lives only on the foundation of our own natures, our own values, and our own interests.

We tend to overestimate what we can do in a short period, and underestimate what we can do over a long period.

When we don't get any treats, we feel depleted, resentful, and angry, and we feel justified in self-indulgence. We start to crave comfort - and grab that comfort wherever we can, even if it means breaking good habits.

Volunteering to help others is the right thing to do, and it also boosts personal happiness

Pouring out ideas is better for creativity than doling them out by the teaspoon.

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.

We must exercise ourselves in the things which bring happiness, since, if that be present, we have everything, and, if that be absent, all our actions are directed toward attaining it.