Lost, Season Four

Locke:
Jack, you're not supposed to go home.

Jack:
And what am I supposed to do?! Oh, I think I remember- what was it that you said on the way out to the hatch? That crashing here was our destiny.

Locke:
You know, Jack, you know that you're here for a reason! You know it. And if you leave this place, that knowledge is gonna eat you alive from the inside out… until you decide to come back.

Jack:
Goodbye John.

Locke:
You're gonna have to lie.

Jack:
Excuse me?

Locke:
If you have to go, then you have to lie about everything, everything that happened since we got to the island. It's the only way to protect it.

Jack:
It's an island, John. No one needs to protect it.

Locke:
It's not an island. It's a place where miracles happen. And- and if you don't believe that Jack, if you can't believe that, just wait 'til you see what I'm about to do.

Jack:
There's no such thing as miracles.

Locke:
Well... we'll just have to see which one of us is right.