How does Montresor demonstrate his superior knowledge of human psychology?

Montresor, Poe’s narrator, demonstrates his superior knowledge of human psychology when he manipulates Fortunato’s ego. Montresor claims that Fortunato “knew a lot about fine wines, and proudly believed that he was a trained judge of them.” Here the reader begins to see Montresor’s knowledge of human psychology revealed; he knows to play on Fortunato’s pride. Montresor does not invite Fortunato to verify his wine but says that he will get Luchresi, a rival, to do so. This plays against Fortunato’s pride and causes him to follow Montresor. Montresor continues to demonstrate an understanding of human psychology when he fakes concern for Fortunato’s health. Montresor says, “But I can see you are trembling with the cold. Come! Let us go back before it is too late.” Fortunato plays down his own concerns and sickness to be contrary to Montresor. This manipulation of Fortunato through false concern ensures that Montresor’s plan will continue. He also plays on Fortunato’s fondness for wine, coaxing him further down the vault with the thoughts of an “Amontillado.” Montresor demonstrates an understanding of human psychology by manipulating Fortunato, playing to his pride, faking concern for his health, and using his desire for fine wine.
Though Montresor’s manipulation of Fortunato is a good example of his superior knowledge of human psychology, it is not the only example. To ensure that there would be no witnesses, he had to get his servants out for the evening. To do so, he notes, “I had told the servants that they must not leave the palace, as I would not return until the following morning and they must care for the place. This, I knew, was enough to make it certain that they would all leave as soon as my back was turned.” Montresor set up the conditions that he knew would result in the servants leaving.
https://americanenglish.state.gov/files/ae/resource_files/the_cask_of_amontillado.pdf