Theme Journal:

Vengeance hurts both sides:
In Medea vengeance hurts both sides. Medea kills her children, which is a big blow to Jason, but it is also a big effect on Medea. It gets her banished and hated by an entire city an enemy to her husband. Leaving her with a reputation of her as a brutal savage women. This isn't really as much in the other plays as much as it is in Medea.

All people are bound by fate:
In Oedipus the king, there is a strong line of fate. First there is a prophecy that Oedipus's parents get stating they will be killed by their son. So they try to have him killed. Oedipus survives and lives up to be strong. He then ends up not knowing, but killing his father, later this leads to more tragedy. Showing that all people are bound by fate.