But, gentlemen, you cannot argue with success.

6 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.

You can hear this line at 00:26:59 in the Blu-ray version of the movie.

Quote context

[...]

- I've just been telling these gentlemen of the new policy you and Mr. Shellhammer initiated.

- I can't say that I approve of your not consulting the advertising department first, but in the face of this tremendous response on the part of the public, I can't be angry with you.

- What's he talking -I'll tell you later.

- Uh, now to continue, gentlemen, I admit that on the face of it, this plan sounds idiotic and impossible.

- Imagine Macy's Santa Claus sending customers to Gimbels.

- But, gentlemen, you cannot argue with success.

- Look at this: telegrams, messages, telephone calls.

- The governor's wife, the mayor's wife.

- Over 500 thankful parents expressing undying gratitude to Macy's.

- Never in my entire career have I seen such a tremendous and immediate response to a merchandising policy.

[...]