Money ... is always the great clue to what is happening in the world.

The rottenness comes from within.

Everyone is a potential murderer-in everyone there arises from time to time thewish to kill-though not the will to kill.

... nothing is so boring as devotion.

You are the patient one, Mademoiselle,' said Poirot to Miss Debenham. She shrugged her shoulders slightly. 'What else can one do?' You are a philosopher, Mademoiselle.' That implies a detached attitude. I think my attitude is more selfish. I have learned to save myself useless emotion.

Everything must be taken into account. If the fact will not fit the theory---let the theory go.

More children suffer from interference than from non-interference.