Look at this section over here.

Even I don't really understand it.

Sheldon, why are you doing this?

I'm a teacher, Leonard.

It's my job.

No, I-I mean, why are you going to so much trouble to prove that you're smarter than Wolowitz?

Oh, it's no trouble; it's actually a pleasure.

You want to know what I think?

I think the idea that someone could be as smart as you, or even smarter, scares the pants off you, and you can't deal with it.

Interesting point.