To my surprise, he did not examine them, merely remarking approvingly as he relocked the desk: "Decidedly, he is a man of method, this Mr. Inglethorp!" A "man of method" was, in Poirot's estimation, the highest praise that could be bestowed on any individual. 
Poirot thought it was important to be ruled by logic and not emotion.
mnli hypothesis: Poirot thought it was important to be ruled by logic and not emotion. premise: To my surprise, he did not examine them, merely remarking approvingly as he relocked the desk: "Decidedly, he is a man of method, this Mr. Inglethorp!" A "man of method" was, in Poirot's estimation, the highest praise that could be bestowed on any individual. 