It's true. All you really need is love.

3 seconds sound clip from the The Bridge on the River Kwai movie soundboard.

You can hear this line at 01:15:42.508 in the Blu-ray version of the movie.

Quote context

[...]

- By the way, sir, I meant to tell you there are trees in this forest very similar to elm. And the elm piles of London Bridge lasted 600 years.

- Six hundred years?

- Yes, sir. Six hundred years. That would be quite something.

- Good morning. I'm looking for an American named Commander Shears.

- Oh, yes. Down on the beach.

- Oh, thank you very much.

- Kiss!

- Too many eyes.

- You give me powders, pills, baths, injections, enemas... when all I need is love.

- It's true. All you really need is love.

- What makes you so sure you'll get a medical discharge?

- Because I'm a civilian at heart, lover. And I always follow my heart. Kiss.

- How's that, commander?

- Oh. Don't call me commander. It's unromantic.

- Now, look, you're an officer yourself. How would you like it if I called you Lieutenant Lover? Let's be democratic. Just call me sir.

- Yes, sir.

- Huh. Brass ahoy. He wants to see you, and he's all yours. I'm going for a swim.

- Don't leave me!

[...]