"On the contrary, sir; I shall have everything in the world that I desire."
Any episode that ends with David Horton saying the final lines, but the best of them is arguably Love And Marriage. Geraldine announces to the townspeople that she will be leaving to Liverpool, and Alice and Hugo's wedding would be her final service. At the very end of the episode, after Geraldine has told David the joke instead of Alice, David simply says "...Stay."
The Parish council's response to Geraldine's letter of resignation in the form of a banner in the village square:
That tall git Simon may have bonked you and dumped you like an old jock strap - but we still love you.
The day after Frank comes out on Dibley Radio, Frank is overcome by how accepting everyone is of his homosexuality (even though it later turns out that no-one actually listened to his radio show):
Frank: Oh, thank you. You are such... dear friends... excuse me a moment, I need a minute to gather myself.
David is in love with Geraldine and immediately realises she's the writer of a letter sent to the parish counsel's newsletter. He could have embarrassed her, or he could have tried to sway her away from her new Love Interest. Instead, he gives her this awesome piece of advice:
“Yes, I’m not sure that’s right, Jim. I would have said something like, ‘From the tone of your letter, you’re clearly a sensitive and intelligent woman. My advice is: Do nothing. If the man is worthy of your love, he’ll come back to you. And if he doesn’t come back, don’t worry. He’s not right for you. And you’d be better alone than with the wrong man.’”
The scene where Harry proposes to Geraldine is equal parts hilarious and heartwarming.
Hugo's proposal to Alice is both hilarious and one of the most heartwarming moments on the show.
"Animals". David's spent the entire series trying to get Geraldine fired, and it looks like her bless-the-animals service will be enough of a disaster for him to finally succeed. After a night of prayer (and chocolate), Geraldine prepares to face the music—and instead is greeted by streams of people and their pets. The music, a blaring, reedy instrumental version of the theme song, which is itself a choral version of Psalm 23, really elevates it.