Now, let us be logical about this.

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

You can hear this line at 00:36:35 in the Blu-ray version of the movie.

Quote context

[...]

- Oh! Well, I can assure you that Mr Topaze will get his medal at the very first opportunity.

- Oh! Do you hear? The Baroness says you will get your medal at the very first opportunity.

- Madam, I I don't know how to thank you.

- Have you found the mistake?

- Headmaster, there is no mistake.

- Now, let us be logical about this.

- When the Baroness tells you you will get your medal, you believe her, yet when she tells you there must be a mistake, you don't believe her!

- Madam, I assure you there cannot possibly be a mistake.

- Here he had another nought yesterday for mathematics.

- There's no doubt about it-the last in the class is Pitard Verniard.

[...]