- The course of true love.
- Gathers no moss.

— Macaulay Connor (James Stewart)

5 seconds sound clip from the The Philadelphia Story movie soundboard.

You can hear this line at 01:01:53 in the Blu-ray version of the movie.

Quote context

[...]

- Why should you be afraid? You know wine never affects me, not in the slightest.

- What she really wants, George, is another dance with you.

- Oh, very well.

- Well, look, George, if it's that much of a chore just to...

- Not for me!

- Oh, no, you don't, Connor. You've been too attentive as it is.

- George. George, please. What will the neighbors think?

- The course of true love.

- Gathers no moss.

- Bunny, where's Brendon?

- He's with Gigs and Fi.

- Boy! Champagne. Just the bottle. I'm going on a picnic.

- You leaving us, Jock?

- Rather. But I'll be back.

- Come on, darling. Champagne. And again and again and again.

[...]