Listen to me, I won't blame you if you've made a mistake. No. Errare humanum est, perseverare diabolicum.
16 seconds sound clip from the Mr. Topaze (1961) movie soundboard.
You can hear this line at 00:35:27 in the Blu-ray version of the movie.
Quote context
[...]
- Don't you see that that's impossible?
- English, nought. Arithmetic, nought. History, a quarter. Deportment, nought.
- Come, please look more closely. Look more closely. Can't you see any mistake?
- No, Headmaster, it's easy to see that there are only noughts.
- However, I will check with my notebook here exactly where I put...
- Be so good as to recalculate the boy's marks.
- Yes, well, it won't take me a moment. I'll...
- Ah! The Minister of Education is dining with us on Wednesday night.
- He and my son, the Baron, are very great friends, you know? They were at school together.
[...]