“The Outsider is always unhappy, but he is an agent that ensures the happiness for millions of 'Insiders.”

“Happiness is your nature. It is not wrong to desire it. What is wrong is seeking it outside when it is inside.”

““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…””

“Man is unhappy because he doesn't know he's happy. It's only that.”

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

“I will always carry you, inside, outside, on my fingertips, and at brain edges.”

“You cannot always control what goes on outside. But you can always control what goes on inside.”

“But my agent has a theory. She says every marriage is jerry-rigged. Even the ones that look reasonable from the outside are held together inside with chewing gum and wire and string.”

“If an egg is broken by outside force, life ends. If broken by inside force, life begins. Great things always begin from inside.”

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