You'd better go before your philosophy corrupts me.
5 seconds sound clip from the Monsieur Verdoux movie soundboard.
You can hear this line at 01:07:49 in the Blu-ray version of the movie.
Quote context
[...]
- Here. This will tide you over for a day or so. Good luck.
- Thank you. Oh, this is too much!
- Don't believe too much. This is a ruthless world, and one must be ruthless to cope with it.
- You'd better go before your philosophy corrupts me.
- Good morning, mademoiselle. Is there a message for me?
- Not yet, huh? How many orders has Madame received so far?
- Two, monsieur: one every three days.
- Good. So there's still a week to go.
[...]