Firs, we have to understand what an epiphany is. An epiphany is a moment of enlightenment or understanding. Sammy, in this story, works in the A & P grocery store. He is a typical teenager in many ways: bored with his job, interested in girls, wanting attention, etc. When a group of girls come into the store and are not treated well (in Sammy's eyes), Sammy makes a choice that leads to his epiphany. He decides to confront his boss about his treatment of the girls, hoping to gain attention from the girls and be a "hero." When he does, he is fired. When he leaves the store after he is fired, he is hoping to find the girls outside, waiting to shower him with their thanks, but they are not there. This is when Sammy realizes that he has made a mistake and that he has done something foolish and finally, that the world will be a difficult place for him from this point onward.
At the end of the day, Sammy says,"I felt how hard the world was going to be to me hereafter." The author, John Updike, is pointing out how ordinary events, such as the three girls being scolded for their appearance, can become important moments in growing up. Sammy discovers he will simply expect a grateful world and he is now ready for new experiences that will teach him even more about life.
firstly the epiphany is simply that life will never be the same, Sammy has experienced a change in his life.
secondly, overanalysis should be made a literary sin.
Thirdly, anyone who claims to be a professor and then cannot get something as simple as whether a character quit or was fired, correct should not have a job.
Sammy quit...twice.. the first time he said it under his breath. When Lengel asked him to repeat it he did and then Lengel told him that he doesn't want to do this to his parents... blah blah blah. He quit! He was NOT fired