“Let not another's disobedience to Nature become an ill to you; for you were not born to be depressed and unhappy with others, but to be happy with them. And if any is unhappy, remember that he is so for himself; for God made all men to enjoy felicity and peace.”

“Then he thought himself unhappy, but happiness was all in the future; now he felt that the best happiness was already in the past.”

“All happy families resemble one another, each unhappy family is unhappy in its own way.”

““Is he then an unhappy man?”
Poirot said:
“So unhappy that he has forgotten what happiness means. So unhappy that he does not know he is unhappy.”
The nun said softly:
“Ah, a rich man…””

“There is, after all, a kind of happiness in unhappiness, if it's the right unhappiness.”

“Unhappiness. The distinction that lies in being unhappy is so great that when someone says, "But how happy you must be!" we usually protest.”

“You are unhappy because you believe in such a thing as happy.”

“The source of all unhappiness is other people. As soon as you learn to
think of other people as noisy furniture, the sooner you will be happy.
- Wally's Keynote Speech”

“All happy people are grateful. Ungrateful people cannot be happy. We tend to think that being unhappy leads people to complain, but it’s truer to say that complaining leads to people becoming unhappy.”

“He knew that there was a difference between something that makes you happy and something that
doesn’t make you unhappy. The trick was convincing yourself these were one and the same.”