You know what I'm thinking? I'm thinking we ought to give up, leave the whole outfit, everything behind, and go back to civilization.

11 seconds sound clip from the The Treasure of the Sierra Madre movie soundboard.

You can hear this line at 00:30:39.615 in the Blu-ray version of the movie.

Quote context

[...]

- Burro!

- What's up?

- Norther, looks like.

- A norther? What's a norther?

- Big winds from the north this time of year. When they blow hard, this desert country stands right up on its hind legs.

- Reckon there's only a few more miles of this heavy stuff. Pretty soon we'll be out of this valley.

- Hey, you fellas, how about some beans? Want some beans? Going through some mighty rough country tomorrow. You better have some beans.

(Howard playing a lively tune on the harmonica)

- You know what I'm thinking? I'm thinking we ought to give up, leave the whole outfit, everything behind, and go back to civilization.

- What's that you say? Go back? Ha ha! Well, tell my old grandmother!

- I got 2 very elegant bedfellows who kick at the first drop of rain and hide in the closet from thunder rumbles.

- My, my, my! What great prospectors!

- 2 shoe clerks reading a magazine about prospecting for gold in the land of the midnight sun... South of the border or west of the rockies.

[...]