This should help:
In tragedy, Fate usually has the last say, showing the limitations of humans when they go too far. The characters cannot be completely responsible for their actions.
The ancient Greeks believed that their gods could see the future, and that certain people could access this information. Independent prophets called “seers” saw visions of things to come. Oracles, priests who resided at the temples of gods—such as the oracle to Apollo at Delphi—were also believed to be able to interpret the gods’ visions and give prophecies to people who sought to know the future. Oracles were an accepted part of Greek life—famous leaders and common people alike consulted them for help with making all kinds of decisions. Long before the beginning of Antigone, Oedipus, Antigone’s father, fulfilled one of the most famous prophecies in world literature—that he would kill his father and marry his mother (these events are covered in detail in Sophocles’s Oedipus Rex). Despite his efforts to avoid this terrible fate, it came to pass. When Oedipus learned what he had inadvertently done, he gouged out his own eyes and was banished from Thebes. Before dying, he prophesied that his two sons, Polynices and Eteocles, would kill each other in the battle for Thebes (see Oedipus at Colonus). This, too, comes to pass.
Yet when the prophet Tiresias visits Creon in Antigone, he comes to deliver a warning, not an unavoidable prophecy. He says that Creon has made a bad decision, but that he can redeem himself. “Once the wrong is done,” Tiresias says, “a man can turn his back on folly, misfortune, too, if he tries to make amends, however low he’s fallen, and stops his bullnecked ways.” While Oedipus never has a choice—his fate was sealed—in this case Creon seems to have more free will. He chooses to remain stubborn, however, until it’s too late and he is caught in the grip of a terrible fate that he