The Big Question

My big question is as follows-
Can one man really change the world?

Oedipus seems to answer this question in a fairly pessimistic way. Although Oedipus tries his best to change the way his world is meant to turn out, fate follows him and allows his own worst fears to come true. In this sense, Oedipus is a story about how nothing you do matters, and in the end you can change nothing. Too bad, cause I was hoping for something that says "yes the only thing that does change the world is someone dedicated." Such is not the case in this ancient tragedy.