[Enter CAIUS MARCIUS]

Hail, noble Marcius!

MARCIUS Thanks. What's the matter, you dissentious rogues,

That, rubbing the poor itch of your opinion,

Make yourselves scabs?

First Citizen We have ever your good word.

MARCIUS He that will give good words to thee will flatter

Beneath abhorring. What would you have, you curs,

That like nor peace nor war? the one affrights you,

The other makes you proud. He that trusts to you, 160

Where he should find you lions, finds you hares;

Where foxes, geese: you are no surer, no,

Than is the coal of fire upon the ice,

Or hailstone in the sun. Your virtue is

To make him worthy whose offence subdues him

And curse that justice did it.

Who deserves greatness

Deserves your hate; and your affections are

A sick man's appetite, who desires most that

Which would increase his evil. He that depends 170

Upon your favours swims with fins of lead

And hews down oaks with rushes. Hang ye! Trust Ye?

With every minute you do change a mind,

And call him noble that was now your hate,

Him vile that was your garland. What's the matter,

That in these several places of the city

You cry against the noble senate, who,

Under the gods, keep you in awe, which else

Would feed on one another? What's their seeking?

MENENIUS For corn at their own rates; whereof, they say,

The city is well stored.

MARCIUS Hang 'em! They say! 180

They'll sit by the fire, and presume to know

What's done i' the Capitol; who's like to rise,

Who thrives and who declines; side factions

and give out

Conjectural marriages; making parties strong

And feebling such as stand not in their liking

Below their cobbled shoes. They say there's

grain enough!

Would the nobility lay aside their ruth,

And let me use my sword, I'll make a quarry

With thousands of these quarter'd slaves, as high

As I could pick my lance. 190

MENENIUS Nay, these are almost thoroughly persuaded;

For though abundantly they lack discretion,

Yet are they passing cowardly. But, I beseech you,

What says the other troop?

MARCIUS They are dissolved: hang 'em!

They said they were an-hungry; sigh'd forth proverbs,

That hunger broke stone walls, that dogs must eat,

That meat was made for mouths, that the gods sent not

Corn for the rich men only: with these shreds

They vented their complainings; which being answer'd,

And a petition granted them, a strange one-- 200

To break the heart of generosity,

And make bold power look pale--they threw their caps

As they would hang them on the horns o' the moon,

Shouting their emulation.

Telling my friend who haven't read Coriolanus before

Hey, I just noticed that you haven't read Coriolanus written by William Shakespeare before!
Which is quite sad, but it's okay. Because from now, Coriolanus will be your favorite book of the year!

Caius Martius, who is the main character of the play, is a lower class hating person who thinks the plebeians(citizens) don't deserve any political power, and he is also a hero of the Rome, as he wins the battle with Volscians, and he gets the nickname, which is also written on the title: Coriolanus. In my personal opinion, it's easy to explain Coriolanus' personality as a "Bully in the high school". Why?   He's cool, as he turned the Volsces upside down, he's strong as everybody knows. As Coriolanus is the strongest of the school(Rome), he wills to become a leader of the plebeians. From that, Coriolanus had to lower the position and ask the plebeians for votes. As everybody knew that he could be the strongest leader, everyone voted. But, if something always goes fine, that's not going to be much interesting as you thought, right?

At this point, the tribunes, Sicinius Velutus and Junius Brutus come in. They claim that Coriolanus cannot be the best leader as his personality, that he always has been rude to people and his aggressive dictions. Sicinius and Brutus temped the citizens and make them get the votes back from Coriolanus. Because of that, obviously, Coriolanus gets mad and that became the greater reason to prove that the tribunes were right: Coriolanus is not suitable for the leader. They decide to vanish Coriolanus, which is "forced change of school" for the "bully".

Volumnia, who is Coriolanus' mother, was keep showing tenacious personality from the beginning of the play. Even she said "Away, you fool! it more becomes a man than gilt his trophy: the breats of Hecuba, When she did suckle Hector, look'd not lovelier than Hector's forehead when it spit forth blood at Grecian sword, contemning." to Vergilia, who is Coriolanus' wife when she freaked out that Coriolanus came back all bloody from the war. Now you can see how Volumnia is creepy. However, she totally changes her position when Coriolanus vanished, even though Coriolanus himself wasn't stressed at all. Volumnia was begging Coriolanus to not leave. He leaves anyway, like an obstinate teenager, and he was planning for the revenge. 

Revenge! You can see how this play goes so interesting! It will take way more time to tell the whole story and I also don't want to ruin the masterpiece by shortening it too much, so it's going to be the better idea to read it by yourself, later on, I guess. I'll borrow you my book if you want to!