Later on, his step parents also leave him in ignorance, and in hiding the truth they are also making the prophecy come true.
This theme as I see it, technicall, is of fate versus freewill.
Every decision that Oedipus makes only brings the revelation closer to being fulfilled.But to fully understand Sophocles work, you ave to understand that for the ancient Greeks the word " tragedy " did n't mean “ a lamentable, dreadful, or fatal event or affair; calamity; disaster. ” For them the idea of such a play, that was a certain and defined theme and structure, is about a person that because of a single tragic flaw becomes the victim of the demon.
" O god-All come true, all busting to light! O light- now let me look my last on you! I stand revealed at last- ”
Despite his flaws and his sins, Oedipus is good and always seeks the truth no matter how devastating.
So, despite the prophecy, it mus ever be denied that Oedipus and his parents had made the choices, not the oracle or the Gods.
Oedipus Rex doesn ’ t ake us only question the role of the gods ( or whatever may decide our fate nowadays: politicians, the economy, the news, and ven our own expectations!), but above all the argument of fate and destiny, and whether we are unwillin to live without external powers deciding our chances.
What happened to Oedipus was the torture of being human, can we escape this curse?