Never start a sentence with the words 'No offense.

One reason that challenge brings happiness is that it allows you to expand your self - definition. You become larger. Suddenly you can do yoga or make homemade beer or speak a decent amount of Spanish. Research shows that the more elements make up your identity, the less threatening it is when any one element is threatened.

He is my fate. He's my soul mate. He pervades my whole existence. So, of course, I often ignore him.

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

When you work regularly, inspiration strikes regularly.

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

Your unhappiness doesn't help anyone else - and in fact, as I mentioned in another answer, happy people are more altruistically inclined. So happiness is not a selfish goal.