"I think you're begging the question," said Haydock, "and I can see looming ahead one of those terrible exercises in probability where six men have white hats and six men have black hats and you have to work it out by mathematics how likely it is that the hats will get mixed up and in what proportion. If you start thinking about things like that, you would go round the bend. Let me assure you of that!"

If you are to be Hercule Poirot, you must think of everything.

If I were at any time to set out on a career of deceit, it would be of Miss Marple that I should be afraid.

What good is money if it can't buy happiness?

Be sure thy sin will find thee out.

An ugly voice repels me where an ugly face would not.

Until one looks back on one's own past one fails to realise what an extraordinary view of the world a child has.