I may not be the best doctor in the world, but I reckon I'm the best one practicing without a license.
6 seconds sound clip from the The Green Berets (1968) movie soundboard.
You can hear this line at 00:43:29 in the Blu-ray version of the movie.
Quote context
[...]
- Jim Beam! You're not feeding him that stuff? You sure it's good for him?
- You questioning my professional competence?
- Can't even keep his rice down anymore.
- What seems to be wrong with him?
- My diagnosis is plague, tuberculosis, old age and no hope. He's tired. Bone tired.
- Check the damage in the dispensary!
- Everything's all right here, colonel!
[...]