- I learned…that one can never go back, that one should not ever try to go back—that the essence of life is going forward. Life is really a One Way Street.
At Bertram's Hotel (1965)
- It is a curious thought, but it is only when you see people looking ridiculous, that you realize just how much you love them.
An Autobiography (1977)
- War settles nothing…to win a war is as disastrous as to lose one!
An Autobiography (1977) pt. 10
- Curious things, habits. People themselves never knew they had them.
The Hound of Death (1933) ‘Witness for the Prosecution’
- He [Hercule Poirot] tapped his forehead. ‘These little grey cells. It is “up to them”.’
The Mysterious Affair at Styles (1920) ch. 10
- Evil is not something superhuman, it's something less than human.
The Pale Horse (1961)
- I'm a sausage machine, a perfect sausage machine.
G. C. Ramsey Agatha Christie (1972)
- Every woman should marry an archaeologist because she grows increasingly attractive to him as she grows increasingly to resemble a ruin.
Russell H. Fitzgibbon The Agatha Christie Companion (1980); attributed, perhaps apocryphal