Any woman can fool a man if she wants to and if he's in love with her.
Curious things, habits. People themselves never knew they had them. [Witness for the Prosecution, also published in The Hound of Death and Other Stories.]
Where large sums of money are concerned, it is advisable to trust nobody.
The contemporary historian never writes such a true history as the historian of a later generation.
One never quite allows for the moron in our midst.
... obsessions are always dangerous.