According to Avery Brooks is in the IBM commercial, "An epiphany is an awakening to the essential nature of things." Or at least, he said something to that affect.
These days, I don't like epiphanies. I largely don't like them because they mean that whatever paradigm you have been seeing the world through, is suddenly just gone.
For example, someone that you trusted has betrayed you over time. You did not want to see it because since you could not believe that anyone that you could care about or that you expended so much love for could disappoint you so much.
Or, you realize that a situation that you find yourself in is never going to get better unless you let go.
Yes, part of adulthood is dealing with epiphanies.