The one characteristic which distinguished man from the animal kingdom was the spirit of self-sacrifice. And you have that quality.

— H. George Wells (Rod Taylor)

13 seconds sound clip from the The Time Machine (1960) movie soundboard.

You can hear this line at 01:07:58 in the Blu-ray version of the movie.

Quote context

[...]

- What are you doing? Why did you put your hand in the fire?

- I never saw it before.

- No knowledge of fire. No books.

- I'm terribly sorry. I'm sorry I was angry with your people. I had no right to be.

- No more than if I'd visited the island of Bali in my own time.

- But, you know, you were safe inside your great house, yet came out into the night to warn me.

- The one characteristic which distinguished man from the animal kingdom was the spirit of self-sacrifice. And you have that quality.

- I think all your people have it, really. It just needs someone to reawaken it.

- I should like to try if you'd let me. Will you?

- I do not understand you but I believe you.

- That's as good a start as any.

[...]