"Friends, Romans, Countrymen, lend me your ear."
Shakespeare, the greatest playwright in Renaissance England, had many times wrote plays on Roman tragedy. As most of the Renaissance writers do, Shakespeare's work is greatly influenced by Greek and Roman philosophies.
Often times, Shakespeare's Greek and Roman plays are tragedies, full of violence and psychological drama. Why is tragedies so important for Greek and Roman theatre? Because many Greek and Roman philosophers finds philosophical means in tragic emotions.
Seneca, the great Roman philosopher taught us that "in so far as we can ever attain wisdom, it is by learning not to aggravate the world's obstinacy through our own response", thus applying to the arc of story telling (which is also an idea from Ancient Greece), "spams of rage, self-pity, anxiety, bitterness, self-righteousness and paranoia" is always the chaos that destroy order.
The tragedy in Shakespeare's Julius Ceasar is a great example to apply Seneca's philosophy. Convinced by Cassius, Brutus betrayed Ceasar for the "greater good" and stubbed a knife into Ceasar's chest and thus created the tragedy of Julius Ceasar "Et tu, Brutus?". In the play, Cassius and his congregation of assassins against Ceasar because :"I was born free as Caesar; so were you...And this man is now become a god, and Cassius is a wretched creature and must bend his body, If Caesar carelessly but nod on him". Cassius' idea is driven by his self-righteousness, bitterness and anger that created out of his frustration: Cassius' wish landed badly on the wall of reality. Seneca taught people not to rise up our expectancy too high, because "We will cease to be so angry once we ceases to be so hopeful." If Cassius did not rise up his hopefulness so high, the entire plot of assassinate Caesar will not happen, and therefore Anthony will not make his speech on Caesar's funeral that kindle Roman citizen's love for Caesar, and at last, Cassius and his rebel will not be killed so tragically.
Many Greek and Roman character had a tragic ending because of their anxiety. Seneca once said :"True happiness is... to enjoy the present, without anxious dependence upon the future", but it is hard to live the way according to Seneca's ideal- the chaos of Titus Andronicus starts when the jealous Emperor of Rome, Saturninus, married the Queen of Goths Tamora because he is angry about Titus's daughter Lavinia would not take his hand. Like wise, in Anthony and Cleopatra, Anthony committed suicide because Cleopatra wanted to test his love for her.
Humanity is based on all the frustration of unsatisfactory, without the power of frustration, we would not have Shakespeare's great works of art.