Subtly Simpsons is a good collection of quotes from the Simpsons. Here are some of my favorites.

Homer: Trying is the first step towards failure.

Homer: Weasling out of work is important to learn; it is what separates humans from animals. Except for weasels.

Jebediah: [on film] A noble spirit embiggens the smallest man.
Edna: Embiggens? I never heard that word before I moved to Springfield
Ms.Hoover: I don't know why. It's a perfectly cromulent word.

Faith: Lisa, I'm Faith Crowley, Patriotism Editor of Reading Digest.
Homer: Oh, I love your magazine. My favourite section is How to increase your word power. That thing is really, really... good.

Milhouse, on falling in love: It was just like Romeo and Juliet, only it ended in tragedy.

Teen1: Oh, here comes that cannonball guy. He's cool.
Teen2: Are you being sarcastic, dude?
Teen1: I don't even know anymore.

Principal Skinner: Mr. Burns, what is the secret to your success?
Mr. Burns: Family, religion, friends... these are the three demons you must slay if you wish to succeed in business.

Homer: And what if we picked the wrong religion? Every week, we're just making God madder and madder!

Also, apparently a bunch of the Simpsons writers are Harvard grads, so the show is littered with Harvard references.