- Sir, the first lesson one learns in business is that discretion is essential.
- Especially for those kinds of deals.

— Auguste Topaze (Peter Sellers)

12 seconds sound clip from the Mr. Topaze (1961) movie soundboard.

You can hear this line at 01:04:38 in the Blu-ray version of the movie.

Quote context

[...]

- Oh, Mr Topaze, you are a wit.

- Commercial law, engineering, local administration.

- That's rather telling, isn't it?

- What do you mean by telling?

- I assume that you're the one that's supplying roadsweepers to the city council. Am I right?

- Sir, the first lesson one learns in business is that discretion is essential.

- Especially for those kinds of deals.

- Perhaps, perhaps, who knows?

- I think you'll find your cigar will draw better if you pierce the end.

- Oh, yes.

- You realise that I know all about the roadsweepers.

[...]