Sophocles has, in Oedipus the King, depicted the underlying relationship of man's free will existing within the cosmic order and fate. The grandiose speech which concludes his appearance before Oedipus, for example, shows clearly the majesty and power with which his office, and indeed his very words, were endowed.
The author of "Oedipus the King" uses ironic devices to convey a tragic attitude toward the struggle of fate and free will The play's meaning through two oppositions is defined by its stage action and its language, are parallel and complimentary to each other. What is meant to occur will happen no matter what that person does.
Throughout the play, Oedipus tries to change his fate. Come, boy, lead me away. Others believe that your life is a matter of choice, and what happens to you during your life is a result of your actions. But do you know what happened afterwards. The sense of sound very rarely stands alone in the tragedy.
On this strong basis of fate, free will doesn't even exist.