As much time as the narrator and the narrator’s community have spent observing, idolizing, and envying Richard Cory, no one fully understands Cory’s psychology or humanity. The poem leaves the truth about whatever drives Cory to suicide unspoken and unknown, but readers don't need to know the exact reason for Cory's ending to get what the poem is trying to say—namely, that no matter how well-off a person may seem (and no matter how happy a person “should” be), people can’t be easily understood based on appearances alone.
The poem presents Richard Cory as a known entity—he is often seen, heard, and admired by the narrator’s community. Throughout the poem, the narrator (who speaks on behalf of the community, “we people on the pavement”) portrays Richard Cory as a man who, on the surface, seems to have it all: money, good looks, gentility, and connection to others.
The community, meanwhile, must work hard and give up luxuries in order to survive, so Cory’s perfect-seeming life appears in direct contrast to the other characters’ struggles. The narrator and the narrator’s community aspire to be, and to live like, Richard Cory, but as the end of the poem makes clear, these other people actually have no idea what the reality of Cory’s life is like.
The poem reveals that the most significant aspects of Cory’s life—whatever drives him, ultimately, to suicide—are beyond the knowledge of the community who assume him to be happy and satisfied. Despite all of Cory’s success, the narrator reveals in the final moments of the poem, Cory kills himself, with no explanation provided. Whatever privilege, power, and success defined Richard Cory for the reader, some unknown other force or factor proves stronger than all the elements of Cory’s life that “should” have made him happy.
The unchanging, calmly-paced structure throughout makes the final lines all the more jolting. The reader knows what to expect rhythmically from each line, just as the community believes they know what to expect from Richard Cory. Cory’s suicide, then, arrives with no warning. The community believes they know who Cory is, and, therefore, are powerless to recognize his need for their support or intervention before it is too late.
“Richard Cory” offers a reminder—and perhaps a warning—about the hidden depths of people whose whole selves are supposedly known and understood. Beneath the trappings of wealth and success, the silent truth of Cory’s unhappiness remained an unseen mystery. By elevating Cory to something other than fully human and vulnerable, the community were unable to fathom Cory’s unknown despair—which has been left, by his death, perhaps forever mysterious.