It is often said that what we value can be determined by what we sacrifice. This is shown in Oedipus Rex with Oedipus’s wife Jocasta.
Before the play begins King Laius and his wife Queen Jocasta are given a prophecy that their child will kill his father and marry his mother. Jocasta and Laius then try to avoid the prophecy. And so they send their child to be killed. It is clear that Laius does this out of fear and in order to protect his life. However, Jocasta does this not out of fear for her husband's life but out of fear of what will happen to her if he is killed. If he does Jocasta would have nothing. Therefore in order to protect herself she must keep Laius alive, so she sacrifices her child.
Than later on after her first husband is dead