"Not twice you shall say calumnies and stay unpunished! [...] Out of my house at once!" (417-504).
"I say you are the murder of the king whose murderer you seek [...] with those you love best you live in foulest shame" (415-423).
"I beg you-do not hunt this out-I beg you, if you have any care for your own life" (1207).
"Polybus was no kin to you in blood [...] no more than I but just so much" (1147).
Oedipus' fatal flaw is his anger because it is what ultimately leads to him killing his father in road rage, starting his downfall.
"If you are the man he says you are, you're bred to misery" (1362).
Oedipus' hubris causes him to continuously deny his role in killing Laius, even though he knows the story sounds similar to his road rage encounter. He refuses to listen to multiple prophecies and accusations that he was involved.
A messenger comes to Thebes with multiple pieces of news for Oedipus: Polybus has died, Oedipus is now the ruler in Corinth, and Polybus was not his real father. This news surprises Oedipus, but he does not yet realize the full truth. He is now more determined to find out more about his family, despite Jocasta's disapproval.
Oedipus realizes the truth about his parents from the messenger. It is at this point when he realizes that the prophecies were true, and he did indeed kill his father and marry his mother even though he tried to avoid this fate.
"O, O, O, they will all come, all come out clearly! Light of the sun, let me look upon you no more after today!" (1363-1365).
Oedipus' ultimate downfall is when he realizes that the prophecies were true. He finds Jocasta dead from suicide and stabs his eyes out of frustration, making himself blind. He then banishes himself from Thebes for the benefit of the city.
"Take me away, my friends, the greatly miserable, the most accursed, whom God too hates above all men on earth!" (1527-1529).
With Oedipus' banishment, Thebes will soon be cured of the plagues, and Oedipus' children are entrusted to Creon. However, the tragedy could have been prevented if Oedipus was told he was adopted from the start, as it may have stopped him from leaving Corinth and starting his downfall.
"Drive me from here with all the speed you can to where I may not hear a human voice [...] Leave me live in the mountains where Cithaeron is [...] so I may die by their decree" (1616-1640)