Speaking purely as an inspector of the Sûreté, I'm afraid that even the obvious often needs confirmation.

6 seconds sound clip from the Phantom of the Opera (1943) movie soundboard.

You can hear this line at 00:37:56.702 in the Blu-ray version of the movie.

Quote context

[...]

- You must have posed for this many times. Every detail is you.

- I never posed for it. Not once.

- You did this from drawings?

- And from memory, Monsieur Inspector.

- Oh.

- To see Christine is to carry her image in your heart and mind forever.

- That old scoundrel Claudin must have stolen it.

- Why?

- Isn't it obvious?

- Speaking purely as an inspector of the Sûreté, I'm afraid that even the obvious often needs confirmation.

- But as a man, Monsieur Daubert, you can understand that sitting there in the orchestra pit night after night and looking at Christine, Claudin probably fell in love with her.

- You admit that is possible, no?

- Christine, did Claudin ever seek more than a casual acquaintance with you?

- No, never.

- Can you imagine so diffident a lover, monsieur? Claudin was barely 50.

[...]