And then I realized they were stronger than me because they could stand it.

8 seconds sound clip from the Apocalypse Now movie soundboard.

You can hear this line at 03:01:40 in the Blu-ray version of the movie.

Quote context

[...]

- I wanted to tear my teeth out. I didn't know what I wanted to do.

- And I want to remember it. I never want to forget it. I never want to forget.

- And then I realized, like I was shot, like I was shot with a diamond, a diamond bullet right through my forehead.

- And I thought, 'My God, the genius of that. The genius.'

- The will to do that, perfect, genuine, complete, crystalline, pure.

- And then I realized they were stronger than me because they could stand it.

- These were not monsters. These were men, trained cadres.

- These men who fought with their hearts, who have families, who have children, who are filled with love, but they have the strength, the strength to do that.

- If I had 10 divisions of those men, then our troubles here would be over very quickly.

- You have to have men who are moral, and at the same time, who are able to utilize their primordial instincts to kill without feeling, without passion, without judgment.

[...]