The answer Oedipus gives, in Part Five,
Chapter II, is “[m]an.” As a baby, man crawls; in maturity, he walks
upright on his two feet; near the end of his life, he walks with
a cane. Answering this riddle, Oedipus saves the city of Thebes
from the curse of the Sphinx, who kills herself. Oedipus does not,
however, realize the implications the riddle has for his own life.
At this point, Oedipus is chronologically between the
two major criminal acts that make up his tragedy, though he commits
them unknowingly. He has just killed his father, Laius, and he is
about to—again unwittingly—marry his mother Jocasta. These actions divide
Oedipus’s life into three stages of its own. First is the early part
of his life in which he grows up as the adopted son of Polybus, from
whom he flees in order to avoid fulfilling an oracle’s prophecy and
committing patricide. Second is his triumphal stage, as he becomes
king of Thebes and marries its widowed queen, Jocasta, after defeating
the Sphinx. Third is his blinded stage, as it is revealed that Jocasta
is his mother and that he has inadvertently slain his true father,
Laius, on his flight from Polybus. We see that Oedipus’s life itself
corresponds to the Sphinx’s riddle. At his birth, his true parents
abandon him because of another prophecy, and he is forced to rely
on the kindness of Polybus. At the second stage, when man stands
erect, Oedipus finds himself on top of the Theban world, glorified
as a hero, deemed a king, and married with children. The last stage,
when man needs a cane to aid his lameness in walking, corresponds
to Oedipus’s self-inflicted blindness, when he is disappointed and
impaired but still alive to continue the last leg of his journey.