One of the things which comes up in Poirot novels and short stories is how immodest Poirot is. He is very willing to say that he is the greatest detective ever, since it’s an indisputable fact and is often relevant to clients. Hastings, whose ideas of modesty are more English, frequently teases Poirot about this. I find this aspect of the stories very interesting, especially because Agatha Christie seemed to think it was funny enough to include quite often.
It is also curious to consider the contrast: Poirot was immodest but humble. Captain Hastings was modest but not humble.
I’m not really sure what to make of this; sometimes Agatha Christie seemed to hold it against Poirot and other times she seemed to side with him. Poirot has asked, quite reasonably, why it is considered better for a man who is good at something to lie and say that he is not. At other times Poirot seems to stray out of merely stating relevant facts and becoming boastful. I suppose to some degree we cannot expect a character written over the course of more than forty years to be entirely consistent. For that matter, real people are not always consistent even within a day, to say nothing of being consistent in many different circumstances over the course of forty years.
(Actually, the duration of Poirot stories is not really calculable; as Agatha Christie observed in her autobiography, given how she made Poirot of retirement age in The Mysterious Affair at Styles, he must have been well over 100 by his later cases, since they were all—or at least, mostly—set contemporaneously.)
A curious contrast to this is Miss Marple, who is extraordinarily modest. In a most Victorian style, she will not allow anyone to say anything positive about her without some sort of disclaiming it; the closest she comes to acknowledging the truth is a qualification to her disclaimer (“though it is true that I’ve been of some little assistance once or twice…”).
Modesty can, of course, be an enormously useful social grace. Being boastful can come at enormous social cost. That said, there is a danger of these things being confused with the far more important moral virtue of humility. Captain Hastings, in the books, frequently thought himself far more clever than he was, though he never said so except in his memoirs. In consequence he made all sorts of mistakes and occasionally made situations worse. In contrast, Poirot’s boasting was always in service of a practical point; he wanted clients to trust him because it was to their benefit to trust him. He wanted police inspectors to trust him, because their cases would go better if they trusted him. He never boasted of his abilities for his own benefit, but only for the benefit of those to whom he boasted.
Agatha Christie was, in her temperament, closer to Miss Marple than to Poirot, though based on her biography she was not greatly like either. Still, I do wonder how much she was actually able to see Poirot’s point of view. Authors cannot give characters what they do not have, but authors can give characters what they do not know that they have. It would be curious to know how much this is a case of that.