Locke: You saw the film, Jack. This is a... this is a two person job, at least.
Sayid: This argument is irrelevant.
Jack: Sayid, don't.
Sayid: Jack.
Jack: Don't. It's not real. Look, you want to push the button, you do it yourself.
Locke: If it's not real, then what are you doing here, Jack? Why did you come back? Why do you find it so hard to believe?
Jack: Why do you find it so easy?
Locke: It's never been easy!
Kate: Maybe you should just do it.
Jack: No...
Jack: It's a button.
Locke: I can't do this alone, Jack... I don't want to.
Locke: It's a leap of faith, Jack.
Read more Dr. Jack Shephard Quotes
From: Lost