Agatha Christie's Poirot1989

Hercule Poirot:
A man may labor and toil to attain a certain kind of leisure in retirement. And then find that, after all, he yearns for the old busy days, and the old occupations he had thought himself so glad to leave. I had already begun to miss the daily toil of my previous employment when, tout ? coup, I was flung back into the midst of the most perversely fascinating work that there is in the world: the study of human nature. A journal came into my possession, in which a murderer had taken the trouble to record for posterity, the thoughts that had accompanied a crime most dastardly. Rarely have I come across such bitterness, such envy and contempt of others, such haughtiness misplaced.