““We will make them tell us what it is," said Poirot. "Third degree?" said Colonel Carbury. "No." Poirot shook his head. "Just ordinary conversation. On the whole, you know, people tell you the truth. Because it is easier! Because it is less strain on the inventive faculties! You can tell one lie - or two lies - or three lies or even four lies - but you cannot lie all the time. And so - the truth becomes plain.””
